(2^3)(4^3) is also 8(4^3) which is 8*64 so its 512
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To find out how many groups of 7 equals 21, you can divide 21 by 7. The result is 3, which means there are 3 groups of 7 in 21. This is because when you multiply 7 by 3, you get 21. So, there are 3 groups of 7 that equal 21.
Simple maths... Divide the 89 & 68 by 2, then multiply both of the answers together - OR multiply the 89 & 68 together, then divide that answer by 4 ! I'll leave you to do the calculations.
There are infinitely many pairs. The simplest is 1 and 140.
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