I think of a number. I multiply the number by 5 and minus 60. I end up with the number i started with.?
607896
I think of a number,\n\nX\n\nI multiply the number by 5 and minus 60,\n\n5X - 60\n\nI end up with the number I started with,\n\n5X - 60 = X\n\nSimplify,\n\n4X = 60\n\nX = 15\n\nThe number is 15. (QED)
755615
24 -- I used a calculator\n\nIf you wanted to take a guess, you could do this:\n\nNotice that 20^2 = 400 and 30^2 = 900, so √576 is in between 20 and 30.\n\nThen notice that 576 ends with a 6, and ask yourself what two numbers between 0-9 when multiplied together produce a number ending with 6?  The answer is 4 and 6.\n\nSo, since you know your answer is between 20-30, and ends with a 4 or 6, you could try 24*24 and 26*26 to see what you get. \n\nIn this way you could, using some deductive reasoning and just a little trial and error, find that √576 = 24.\n\nHope that helped!\n\n~ ♥ ~
445906
10 times 10 times 10 1000\nyou could use a calculator alot easier
1174474
DIVIDE IT BY 100 TIMES THAT BY 20 AND THEN ADD THAT ONTO 12,590
488491
U could do y=-2x+5 or you could do y=-7x (I luv math)
1160615
(5 divided by 5) plus 5 (times 5)=(1+5)X5=30
635110
For doing squares of numbbers ending with 5, here it is\n\ntake the numbers before 5 and multiply it by its next number and write product followed by 25 e.g.\n65*65 = (6*(6+1)) and 25 = 6*7 and 25 = 4225
864869
When you round off a number, look to the right. Is the  number to the right of the place where you're rounding higher or lower than 5? \n\nThe 6 is in the thousands place. What number is to the right? If it's 5 or higher, round up.\n\nThe 8 is in the hundreds place. What number is to the right? If it's 5 or higher, round up.
218316
Thats funny.  Tell me another one.\n\nMaybe its like 5-2=2\n\n\nlol
926120
your variable is x so you replace that with 8, since x=8     since there are no signs between the 9 and x  in  9x  , that means to multiply them  so that is 72       so your answer is 72 + 5 or 77  , hope that helps
1088739
The answer is 4100.  After adding the first 7 terms, you get a sum of  4090, then, adding another ten, your brain just automatically jumps to 5000.  Of course, if you added it on paper you would see that the answer is 4100, but doing mental math, your brain see differently.  \n\nI saw this in a logic book once, and another Yahoo Answers \n\nquestion.
741355
There are a few ways to find this, but the answer depends on whether we can repeat numbers in the combination and if the order matters.  \n\nIf we cannot repeat numbers and order matters:\n# combinations = 9*8*7*6*5*4 = 60480\nThere are 9 choices for the first digit, 8 for the second (because one is already taken), and so on.  We multiply the choices for each digit to find the total number of choices.\n\nIf we can repeat numbers and order matters:\n# combinations = 9^6 = 531441\nThere are 9 choices for each of the six digits.\n\nIf we cannot repeat numbers and order does not matter:\n# combinations = 9!/(6!*3!) = 84
45380
its simple ... 80*70*60 ... 10*0 = 0 !!\n\nright isnt it ??? :D
630246
multiply 5,000 x .30 = 1,500 Then you subtract it from the 5,000 which equals 3,500. Just in case you need to do it again.
251013
150 is 90 plus 60.  that's a hint.
207303
We could change the second + to 4 by putting a vertical small line\n\n5 + 5 + 5 = 550\n5 + 5 4 5 = 550
352166
8\ntake away o from top and you're left with o on bottom - half - nothing\nor i guess 10 could work, too (or any double digit ending in 0) take away the first number and you're left with 0