You could solve by repetitive subtraction, or division. 45/8 = 5, with remainder of 5.
So 5 boys can each have 8 marbles, which is 40 marbles, and there will be 5 marbles remaining.
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%*amount=answer .40*45=answer answer=18 boys
45 __ 91
tom had 45 marbles. he gave some to dan. he had 19 marbles left. how may marbles did he give to dan?
make it out of 100, so 40 times 2.5 equals 100 and 18 times 2.5 equals... 45 so its 45 percent
360/45 = 8 sides