Question

Harris said that 15 x 9 is equivalent to 45 x 3 because you can multiply

one dimension by 3 and divide the other dimension by 3. His partner said that only
works when you double one number and halve the other. Who is right? Explain.

Answer 1

Harris is right

Explanation:

That actually works with all numbers.

What Harris did to 15 x 9 is multiply the 15 by 3 to get 45 and divide 9 by 3 to get 3.

So since he multiplied one of the "dimensions" by 3 and divided the other by 3 the product of the 2 dimensions is the same as the original.

Goos Luck!