1. + 6 + 9 + 7 + 12 - 4 - 3 - 8 half double What's the rule? 12 1 13 4 16
Input
Output 12 1 13 4 16 9 22
+ 6
+ 9
+ 7
half
+ 12
- 4
- 3
- 8
double

2. + 6 + 9 + 7 - 4 - 3 - 8 half double What's the rule? 2 4 5 10 8 16 25
Input
Output 2 4 5 10 8 16 25 50
+ 6
+ 9
+ 7
half
- 4
- 3
- 8
double

3. + 6 + 9 + 7 - 4 - 3 - 8 half What's the rule? 4 10 5 11 7 13 12 18
Input
Output 4 10 5 11 7 13 12 18
+ 6
+ 9
+ 7
half
- 4
- 3
- 8

4. + 9 + 7 - 4 - 3 - 8 half What's the rule? 7 4 9 6 13 10 20 17 Input
Output 7 4 9 6 13 10 20 17
+ 9
+ 7
half
- 4
- 3
- 8

5. What's the rule?
Input
Output 4 2 6 3 8 10 5
+ 9
+ 7
half
- 4
- 8

6. What's the rule?
Input
Output 7 3 9 5 10 6 12 8
+ 9
+ 7
- 4
- 8

7. What's the rule?
Input
Output 9 1 12 4 16 8 20
+ 9
+ 7
- 8

8. What's the rule?
Input
Output 3 12 4 13 7 16 10 19
+ 9
+ 7

9. Thanks for helping Riley!
If + 7 is the rule, what would be the output?
Input
Output 3 6 8 23
Thanks for helping Riley! 10 13 15
+ 7 30

10. Enjoy these other books by Kathleen L. Stone Penguin Place Value
A Math Adventure
Number Line Fun
Solving Number Mysteries
Riley the Robot
An Input/Output Machine
Mason the Magician
Hundreds Chart Addition
Katelyn’s Fair Share Picnic
More Math Fun
Money Tree Mysteries
Adventures with Quarters
Additional ideas and resources are available at: