Multiply by 7 and 8

28

32

63

49

80

7 x 1 = 7, 7 x 2 = 14, 7 x 3 = 21, 7 x 4 = 28, 7 x 5 = 35, 7 x 6 = 42, 7 x 7 = 49, 7 x 8 = 56, 7 x 9 = 63, 7 x 10 = 70

8 x 1 = 8, 8 x 2 = 16, 8 x 3 = 24, 8 x 4 = 32, 8 x 5 = 40, 8 x 6 = 48, 8 x 7 = 56, 8 x 8 = 64, 8 x 9 = 72, 8 x 10 = 80

The associative property states that the way in which numbers are grouped in multiplication does not change the product. For example, (2 x 3) x 4 = 2 x (3 x 4).

The commutative property states that the order in which two numbers are multiplied does not change the product. For example, 4 x 5 = 5 x 4.

Multiplication can be understood as repeated addition. For example, 7 x 4 can be seen as adding 7 four times: 7 + 7 + 7 + 7 = 28.