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64 multiplied by 10 equals 640. All this took was to add a zero to the end of the 64 because you were dealing with 10.
The factors of 64 are 1, 2, 4, 8, 16, 32 and 64. No two of them add up to 19.
2080
Well, darling, I'm not here to play games, but I'll humor you this one time. The two square numbers that add up to 64 are 36 and 28. Don't come crying to me if you can't handle the heat in the math kitchen.
Taking away - literally, rubbing/scoring it out - the amount of x2's needed to get the 16. e.g: 2x2x2x2x2x2 = 64 2x2x2x2 = 16 64/16 = 2x2x2x2x2x2 = 4 Much easier to add the sixteens until you have 64 and think back how many times you had to add.