Number & the laws of arithmetic

Which statement is always true?

1. A108 × 6 = 6 × 108
2. B108 − 6 = 6 − 108
3. C108 ÷ 6 = 6 ÷ 108
4. DAll of these

Using the distributive law, 36 × 8 is the same as…

1. A(30 × 8) + (6 × 8)
2. B30 × 8
3. C36 + 8
4. D(36 × 4) × 2

Which calculation shows the commutative law?

1. A34 × 16 = 16 × 34
2. B34 × 16 = 30 × 16 + 4 × 16
3. C34 + 16 − 16
4. D34 ÷ 16

For these numbers, 13 × 26 = 26 × 13.

For these numbers, 65 × 36 = 36 × 65.

For these numbers, 43 − 21 = 21 − 43.

For these numbers, 17 − 61 = 61 − 17.

For these numbers, 72 × 20 = 20 × 72.

For these numbers, 26 × 65 = 65 × 26.

For these numbers, 24 − 51 = 51 − 24.

For these numbers, 19 + 78 = 78 + 19.

For these numbers, 67 × 55 = 55 × 67.

For these numbers, 37 × 80 = 80 × 37.

For these numbers, 46 − 15 = 15 − 46.

For these numbers, 71 + 60 = 60 + 71.

For these numbers, 52 + 40 = 40 + 52.

For these numbers, 40 ÷ 30 = 30 ÷ 40.

For these numbers, 64 × 54 = 54 × 64.

For these numbers, 21 − 51 = 51 − 21.

For these numbers, 70 × 96 = 96 × 70.