If you have the Year 4 CGP Maths books:
- Mental Workout - Page 11 Exercise 11
- 10 Minute Weekly Workouts - Page 20/21 Workout 10
If you have the Year 3 CGP Maths books:
- Mental Workout - Page 8
- 10 minute Weekly Workouts - Page 16/17
If you have the Year 1 CGP Maths books:
- Mental Workout - Page 5
- 10 minute Weekly Workouts - Page 10/11