Find the perimeter and area of the square on the 9cm side and also help solve the second. Imagine the numbers 60

Find the perimeter and area of the square on the 9cm side and also help solve the second. Imagine the numbers 60 and 75 as the sum of two terms, each divisible by 5.

1) Perimeter is the sum of the lengths of all sides. A square has 4 identical sides, each 9 cm, we can find 9 + 9 + 9 + 9. BUT! Knowing that multiplication is the addition of identical terms, we write P = 9 * 4 = 36 cm.
Area is the product of the length and width of the square. Length -9cm, width-9cm, we find: S = 9 * 9 = 81 cm2.
2) There are a lot of options here: 60 is 55 + 5, 50 + 10, 45 + 15, 40 + 20, 35 + 30. 75 is 70 + 5, 65 + 10, 60 + 15, 55 + 20, 50 + 25, 45 + 30, 40 + 35. It must be remembered that numbers ending in 0 and 5 are divisible by 5 without a remainder.