-7
Its square is +49 and 56 less than 49 is -7.
Another answer is +8.
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The number is 32 because (2*32) -8 = 56
It is 56 because it is greater than 50 but less than any other number. 7x8=56
That means to multiply the number by itself, that is, 56 x 56.
"7" is the number because its square root is "49" & 49+7=56
56