1 x 512, 2 x 256, 4 x 128, 8 x 64, 16 x 32.
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64 times 8 equals 512. This multiplication can be solved by adding 64 to itself 8 times, or by recognizing that multiplying by 8 is the same as doubling the number three times (64 doubled is 128, then 256, then 512). The product of 64 and 8 is a fundamental multiplication fact that can be memorized to improve mental math skills.
It is the square root of 512 which is about 22.627417
751
500 equals 500 - whether with multiplication or division or whatever.
544