Write down the next three numbers and describe each pattern: a) 3, 6, 9, 12 b) 1, 8, 15, 22 c) 7, 9, 8, 10

Here are the solutions to the patterns:

1. Write down the next three numbers and describe each pattern:

a) The pattern is adding 3 to the previous number.

$$3, 6, 9, 12, \mathbf{15, 18, 21}$$

Description: Add 3 to the previous number.

b) The pattern is adding 7 to the previous number.

$$1, 8, 15, 22, \mathbf{29, 36, 43}$$

Description: Add 7 to the previous number.

c) The pattern alternates between adding 2 and subtracting 1.

$$$$