The smallest number that both 8 and 10 can go into is their least common multiple (LCM), which is the smallest multiple that both numbers share. The LCM of 8 and 10 is 40, as 8 x 5 = 40 and 10 x 4 = 40. Therefore, 40 is the number that both 8 and 10 can evenly divide into.
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8 x 9 x 10 = 720
You have to write an equation for this. When you do percents, you always have to convert them to decimals. (Therefore, 80% is .80 as a decimal) .80x = 8 Divide both sides of the equation by .8 and you'll get x = 10
136, 272, 408, 544, 680 +136 . . .
80% cause 8/10=80%
They both go into 1440, for example.