21x21 equals 7x7x9
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24 x7 =168 hours
If you mean n times 7 equals 56... Then the value of n is 8 !
21 x 7 = 147One way to do this may be:(20 x 7) + (1 x7) = 147Or:(2 x (10 x7)) + (1 x 7) = 147In other words, break the problem up into small manageable chunks.
There are 18 feet times 7 feet equals 126 square feet
3 and 7 multiplies to 21 and equals to 10