YorkieTalk.com Forums - Yorkshire Terrier Community
Page 2 of 5 1 2 345
Show 30 post(s) from this thread on one page

YorkieTalk.com Forums - Yorkshire Terrier Community (https://www.yorkietalk.com/forums/index.php)
-   Off Topic Discussions (https://www.yorkietalk.com/forums/off-topic-discussions/)
-   -   Okay Math Geniusues... What's 48÷2(9+3) ? (https://www.yorkietalk.com/forums/off-topic-discussions/225558-okay-math-geniusues-whats-48-2-9-3-a.html)

BabyGirl Rosie 04-07-2011 05:24 PM
Here is the math teachers answer. Lol. :D Let me tell you I did send a text to two other math teacher and we all have the same answer. We came up with 288.

48 / 2(9 + 3)
Grouping symbols first
48/ 2 (12)
Then 48/2 which is 24 then times 12.
Answer is 288!

So, here is the math teachers answers!! :D

JeanieK 04-07-2011 05:34 PM
Quote:
Originally Posted by BabyGirl Rosie (Post 3490895)
Here is the math teachers answer. Lol. :D Let me tell you I did send a text to two other math teacher and we all have the same answer. We came up with 288.

48 / 2(9 + 3)
Grouping symbols first
48/ 2 (12)
Then 48/2 which is 24 then times 12.
Answer is 288!

So, here is the math teachers answers!! :D
:thumbup:

My degree is in accounting, but I didn't want to play that card. thanks for verifying. :)

BabyGirl Rosie 04-07-2011 05:37 PM
Quote:
Originally Posted by JeanieK (Post 3490913)
:thumbup:

My degree is in accounting, but I didn't want to play that card. thanks for verifying. :)

Ha ha! Well I wasn't about to post until I verified with others. Order of operations is very easy to make mistakes. I do it with my students every year. I post a problem and will end up with at least 4 different answers. I kept thinking it was 288 but wanted to ask around before I posted! ;)

JMuedog 04-07-2011 05:45 PM
Quote:
Originally Posted by linz06 (Post 3490598)
I believe the answer is 288..

48÷2(9+3)

48 ÷ 2 x (9+3)

48 ÷ 2 x 12

24 x 12

=288

After the parentheses, there is only multiplication and division left to do, and they follow left to right.
This is how I'd do it. Man, I need a math refresher. I tried long division he other day and it wasn't easy.

What's the answer?

TxVicki 04-07-2011 05:54 PM
And this is why I was never good in math. LOL Over my head.

MyTrixie143 04-07-2011 06:29 PM
Well by doing math how I was taught I came up with 288 as well. Parentheses comes first. Division and multiplication are equal there is no set order for them. So after the parentheses you go left to right to solve it.

Interesting, I will have to get out my old math book to see which is right. I could ask my brother who has a degree in accounting and is a Math teacher.

JeanieK 04-07-2011 06:35 PM
Quote:
Originally Posted by MyTrixie143 (Post 3491008)
Well by doing math how I was taught I came up with 288 as well. Parentheses comes first. Division and multiplication are equal there is no set order for them. So after the parentheses you go left to right to solve it.

Interesting, I will have to get out my old math book to see which is right. I could ask my brother who has a degree in accounting and is a Math teacher.
:thumbup:

You did it right.

lisaly 04-07-2011 06:38 PM
Quote:
Originally Posted by MyTrixie143 (Post 3491008)
Well by doing math how I was taught I came up with 288 as well. Parentheses comes first. Division and multiplication are equal there is no set order for them. So after the parentheses you go left to right to solve it.

Interesting, I will have to get out my old math book to see which is right. I could ask my brother who has a degree in accounting and is a Math teacher.
That''s how I solved it, and I came up with 288 also.

MyTrixie143 04-07-2011 06:42 PM
Quote:
Originally Posted by JeanieK (Post 3491018)
:thumbup:

You did it right.
Thanks, I thought I did it right. It's only been 2 years since I've been out of college and took math courses. I didn't think I was that rusty.

ArmaniMan 04-07-2011 06:53 PM
It is 288. When people do PEMDAS, they forget that MD and then AS are done left to right.

AllDogBoots 04-07-2011 07:02 PM
Quote:
Originally Posted by ArmaniMan (Post 3491060)
It is 288. When people do PEMDAS, they forget that MD and then AS are done left to right.
I solved the math problem but have no idea what you just said:confused:

lisaly 04-07-2011 07:13 PM
Quote:
Originally Posted by AllDogBoots (Post 3491083)
I solved the math problem but have no idea what you just said:confused:
PEMDAS--order of operations
Parenthesis first, next exponents, multiplication or division (solve left to right), then addition or subtraction (also left to right).

MD multiplication or division, whichever comes first
AS addition or subtraction, again left to right

kjc 04-07-2011 07:14 PM
2 bc you have to get rid of the parentheses before you do the left to right ops.

48/2(9+3)
48/2(12)
48/24
2
:D

Ellie May 04-07-2011 07:25 PM
Okay, if M and D are equal, then it makes sense why it would be done left to right , but:

48/2(9+3)
48/2(12)
We still haven't gotten rid of the parentheses. So we can just pull 12 out and make it read 48/2x12 and ignore that the 12 is still in the ()?

MyTrixie143 04-07-2011 07:29 PM
Quote:
Originally Posted by kjc (Post 3491113)
2 bc you have to get rid of the parentheses before you do the left to right ops.

48/2(9+3)
48/2(12)
48/24
2
:D
Ah by why did you multiply the 2x12 first? After the parentheses in this equation you work left to right. The parentheses around the 12 just means multiply that is the only reason it is still there, to tell you to multiply. Technically you got rid of the parentheses by adding the 9+3. So the equation technically looks like this: 48/2x12. Working from left to right you divide before you multiply hence coming up with 288.

MyTrixie143 04-07-2011 07:31 PM
Quote:
Originally Posted by Ellie May (Post 3491138)
Okay, if M and D are equal, then it makes sense why it would be done left to right , but:

48/2(9+3)
48/2(12)
We still haven't gotten rid of the parentheses. So we can just pull 12 out and make it read 48/2x12 and ignore that the 12 is still in the ()?
Technically you got rid of the parentheses by adding and getting 12. It is now only there to show that you need to multiply the 2 and the 12.

JeanieK 04-07-2011 07:36 PM
Quote:
Originally Posted by Ellie May (Post 3491138)
Okay, if M and D are equal, then it makes sense why it would be done left to right , but:

48/2(9+3)
48/2(12)
We still haven't gotten rid of the parentheses. So we can just pull 12 out and make it read 48/2x12 and ignore that the 12 is still in the ()?
Yes, you do the math that is in the ( ). Once thfat is done there is not longer fa nee for the parentheses. The order would be different if there were no ( )

48/2*9+3 Would give you a different answer because you would do the multiplication and division first and the addition last

48/2*9+3
48/2=24
24*9=288
216+3=219

See why the parentheses are important?

JeanieK 04-07-2011 07:38 PM
Quote:
Originally Posted by MyTrixie143 (Post 3491147)
Technically you got rid of the parentheses by adding and getting 12. It is now only there to show that you need to multiply the 2 and the 12.
yes, you could, at this point, replace the parentheses with * or x

JeanieK 04-07-2011 07:42 PM
Quote:
Originally Posted by MyTrixie143 (Post 3491143)
Ah by why did you multiply the 2x12 first? After the parentheses in this equation you work left to right. The parentheses around the 12 just means multiply that is the only reason it is still there, to tell you to multiply. Technically you got rid of the parentheses by adding the 9+3. So the equation technically looks like this: 48/2x12. Working from left to right you divide before you multiply hence coming up with 288.
And that is why it is important to work left to right, if you don't you get the wrong answer.

if we knew where the numbers came from the order would be more obvious.

107barney 04-07-2011 07:46 PM
48÷2(9+3)

I am solving the problem by first dealing w/ the parentheses
1) 9+3 = 12

Then I am treating multiplication and division as on equal footing but going from left to right to solve the equation

2) 48÷2 = 24

3) 12 x 24 = 288

Therefore 48÷2(9+3) = 288 :D

kjc 04-07-2011 07:47 PM
Quote:
Originally Posted by Ellie May (Post 3491138)
Okay, if M and D are equal, then it makes sense why it would be done left to right , but:

48/2(9+3)
48/2(12)
We still haven't gotten rid of the parentheses. So we can just pull 12 out and make it read 48/2x12 and ignore that the 12 is still in the ()?
Exactly... no bc the number outside the () has to be applied to the number inside the () before moving forward. The () is like glue, all operations must happen to it first before going on. You see 2(12) then you can read it as 2 x 12, but you perform the function and make it 24, then put it back into the problem 48/24. which =2.

If that were allowed, you could also do it like 48/2x9(+3) or 48/2x9+3 or ...

kjc 04-07-2011 07:55 PM
Quote:
Originally Posted by 107barney (Post 3491173)
48÷2(9+3)

I am solving the problem by first dealing w/ the parentheses
1) 9+3 = 12

Then I am treating multiplication and division as on equal footing but going from left to right to solve the equation

2) 48÷2 = 24

3) 12 x 24 = 288

Therefore 48÷2(9+3) = 288 :D
You skipped a step, and added a step. You used the 2 twice, X 12 then 48/2... you can only use it once, and it's a multiplier of the number inside the ().:eek::D

Ellie May 04-07-2011 08:02 PM
So if we can just get rid of the () after adding:

48/2(12)=
48/2x12

Then that means that the quadratic equation:
x=-b+or- the square root of b^-4(a)(c)/2(a)

Then why don't we divide everything by 2 in this case and then multiply by a? In this case we could remove the a from the () and write 2 x a, but it still has to be done separately from the rest of the problem.

107barney 04-07-2011 08:02 PM
Quote:
Originally Posted by kjc (Post 3491183)
You skipped a step, and added a step. You used the 2 twice, X 12 then 48/2... you can only use it once, and it's a multiplier of the number inside the ().:eek::D
Huh?

I'll rephrase --

48÷2(9+3)

Answer:
I added 9 + 3 to get 12 to lose the parenthesis giving me
48÷2 x 12 and you have to work from L to R.

48 divided by 2 = 24 and 24 x 12 = 288

Not sure what you mean about using the two twice.

107barney 04-07-2011 08:07 PM
Quote:
Originally Posted by Ellie May (Post 3491195)
So if we can just get rid of the () after adding:

48/2(12)=
48/2x12

Then that means that the quadratic equation:
x=-b+or- the square root of b^-4(a)(c)/2(a)

Then why don't we divide everything by 2 in this case and then multiply by a? In this case we could remove the a from the () and write 2 x a, but it still has to be done separately from the rest of the problem. So how can we be sure that the (9+3) is not part of the denominator if written on one line?
Here is the equation for the answer 2:

48/[2(9+3)]

This makes the denominator 24 so when you do this above equation, you would get two. BUT...the question posted did not have the brackets, you guys can't make them up.

roseylovestosho 04-07-2011 08:16 PM
I am watching this thread closely because I hope you guys will arrive at the answer because quite frankly Algebra perplexes me! I do love calculus though!

JMuedog 04-07-2011 08:16 PM
Quote:
Originally Posted by fasteddie (Post 3490592)
That's what I thought too, but there seems to be fierce debate about the order of which goes first and whatnot... :)

I won't spoil it yet... ;p
I'm beginning to see the debate :D

107barney 04-07-2011 08:27 PM
Quote:
Originally Posted by Ellie May (Post 3491195)
So if we can just get rid of the () after adding:

48/2(12)=
48/2x12

Then that means that the quadratic equation:
x=-b+or- the square root of b^-4(a)(c)/2(a)

Then why don't we divide everything by 2 in this case and then multiply by a? In this case we could remove the a from the () and write 2 x a, but it still has to be done separately from the rest of the problem.
If the real answer to the question is 288 then your writing of the quadratic equation is incorrect, you would have actually written this --

x = -b + or - the square root of b squared -4ac --> all that divided by 2

Multiplied by a over 1 meaning a/1

Otherwise, if the answer is 2, then you have correctly wrote out the quadratic equation.

I believe the quadratic equation has 2a as the entire denominator, which would give me the 288 answer to the question posted.

kjc 04-07-2011 08:31 PM
Quote:
Originally Posted by 107barney (Post 3491196)
Huh?

I'll rephrase --

48÷2(9+3)

Answer:
I added 9 + 3 to get 12 to lose the parenthesis giving me
48÷2 x 12 and you have to work from L to R.

48 divided by 2 = 24 and 24 x 12 = 288

Not sure what you mean about using the two twice.
Oh gotcha... but...

48÷2(9+3) The 2(means 2 X what is in the () and they cannot be removed until the contents of the () are multiplied by the number in front of the (). That is a rule. Really. It can be done this way 2(12) or the Rule of Distribution which would be 2x9 + 2x3, or 18 + 6 = 24.

107barney 04-07-2011 08:37 PM
Quote:
Originally Posted by kjc (Post 3491235)
Oh gotcha... but...

48÷2(9+3) The 2(means 2 X what is in the () and they cannot be removed until the contents of the () are multiplied by the number in front of the (). That is a rule. Really. It can be done this way 2(12) or the Rule of Distribution which would be 2x9 + 2x3, or 18 + 6 = 24.

It only matters what is INSIDE the parentheses....Once you solve what is inside, you can change the parenthesis to an asterisk and go from L to R to get 288.

x/y(4-2) is the same as x/y*2 NOT x/(y*2)


All times are GMT -8. The time now is 12:04 PM.
Page 2 of 5 1 2 345
Show 30 post(s) from this thread on one page

Powered by vBulletin® Version 3.8.9
Copyright ©2000 - 2025, vBulletin Solutions, Inc.
Copyright ©2003 - 2018 YorkieTalk.com
Privacy Policy - Terms of Use


1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168