Answer:

1. 27, 31,  35

2. 41, 49,57

3. 17,20,23

4.54,63,72

5.18,19,20

Answer:

1. 7, 11, 15, 19, 23, 27, 31, 35

( solution: + 4 or skip counting by 4 )

2. 1, 9, 17, 25, 33, 41, 49, 57

( solution: + 8 or skip counting by 8 )

3. 2, 5, 8, 11, 14, 17, 20, 23

( solution: + 3 or skip counting by 3 )

4. 9, 18, 27, 36, 45, 54, 63, 72

( solution: + 9 or skip counting by 9 )

5. 13, 14, 15, 16, 17, 18, 19, 20

( solution: + 1 or skip counting by 1 )