this is my childs homework question; what 6 numbers below add up to make a total of 31? use:8 9 9 1 5 8 1 1 1?
969964
the best answer that i can come up with is that your kid is going to get an F! sorry.
306814
204 total.\nThe size breakdown is as follows:\n204 =1+4+9+16+25+36+49+64 = n(n+1)(2n+1)/6 when n=8 \n\n1 size 8x8\n4 size 7x7\n9 size 6x6\n16 size 5x5\n25 size 4x4\n36 size 3x3\n49 size 2x2\n64 size 1x1
16992
Adding 36 and 24 and subtracting 9 can easily be done in your head if you have graduated from elementary school.  Why someone couldn't is beyond me.
48530
Looking at...\n\n>>>>>>>>> 0\n>>>>>>>>> 1\n>>>>>>>>> 2\n>>>>>> etc.\n>>>> 999999\n\n...in the ones or 10^0 column you repeat\n\n>>>> 0+1+2+3+4+5+6+7+8+9 = 45\n\n100,000 times.  That gives you 4,500,000.\n\nIn the tens or 10^1 column you repeat\n\n>>>> 10*0 + 10*1 + 10*2 + ... + 10*9 = 10*45\n\n10,000 times.  (i.e., group ten 0's in a row, then ten 1's in a row, ..., ten 9's in a row, and repeat that 10,000 times.)  That also gives you 4,500,000.\n\nLikewise with the 10^2, 10^3, 10^4, and 10^5 columns.\n\nSo far that totals 6 times 4,500,000 = 27,000,000.\n\nAll that remains is to add in the 1 from 1,000,000 to get the final total of 27,000,001.\n\nCheck: compare to previous reply. :-)\n\n(How do you get this thing to indent a line?)
93641
Okay, 2 + 4= Look at 2 now look at 4, 4 is 4 pieces and 2 is 2 pieces. add the 4th piece and the second piece = 6! Duh!
124188
1398\n\nEasy way:\nRound 399 to 400 (+1)\nRound 999 to 1000 (+1)\nAdd 1000+400=\n1400\nSubtract the two you added.\n1398
761088
I don't know... I try to use math as little as possible... today I'm up to only 8 times.... doh!  counting them makes 9!
221696
Addition!  aka the sum of 3 and 5 is 8.
609300
This is more of a word problem or a riddle than a math problem.\n\nThe answer is 7 (SEVEN).  Remove its first letter and it becomes EVEN!
761643
How many at a time?  You didn't say.\n\nThe number is an expression called  nCr, which is \nn!/((n-r)!r!), but it's pretty simple to think of it this way:\n\nI'll suppose you want them 3 at a time.  Then, for the first one, with 6 letters to choose from, write 6*5*4 on top (three factors because we want 3 letters) and 1*2*3 on the bottom\n6C3 = 6*5*4/(1*2*3)\n        = 20\n\nIf there had been 10 letters and we wanted to know the number of combinations 4 at a time, we would put four factors on top and bottom:\n10C4 = 10*9*8*7/(1*2*3*4)\n          = 210
951171
Add them... 8+7+7+5+3+2+2= 34 and divided by 7\nYyou have 34/7=\nYou know 4x7= 28 so you need 6 more to reach 34\nso you have 4 and 6/7
221530
Add them together and divide by 5.\n\nWow. I could seriously have you people do my homework for me. Every night. I'll type out the problems and see how you all do. :P JP
642186
69..\n\nand try to paraphrase your friggin homework...
930851
... 1 + 1 + 1 equals 3.\n\nDo you make any sense AT ALL?
403326
1+2+3+4+5+6+7+8+9/3+8*2-4\n=36+3+16-4\n=51
938348
There are many combinations. One of them is 1,2,3,4,5,16. Is there some specific property you wanted these six numbers to have?
306637
There's a trick to figuring this out quickly.\n\nFor each number between 1 and 499 there is a corresponding number between 501 and 999 which, when added together, equals 1000.\n\nFor example:\n\n1 + 999 = 1000\n2 + 998 = 1000\n...\n499 + 501 = 1000\n\nNow, there are 499 pairs like that.  Add them together and you get 499,000\n\nAdd to that 1000 and 500, and you get 500,500, which is your total.