Question

This rectangle has an area of 20 and a perimeter of 18

If Jessica adds a row of 5 tiles at the top of this rectangle what will the new perimeter be?

Answer 1

28

Explanation:

you have an area of 20, which is a clue to find two numbers that could multiply to get 20. Then, to be sure it is the right pair of numbers, you will add them twice to see if you get 18 as the perimeter. I found the two numbers 5, and 4. I added 5 to 4, and added 9+9+5+5, and got 28.