Year 2 Addition and subtraction Return to Primary Maths Resources

Student resources.

The Add and Take-away Path:
What Was in the Box?:
Doing and Undoing:

Thinking of a number

Give students the following instructions.

  • I’m thinking of a number. I multiply it by 5 and then subtract 7. The answer is 58. What number was I thinking of?
  • I’m thinking of a number I multiply it by 3.I then subtract 6.I then divide by 2 and then add 5. The answer is 23. What was my number?
Get students to discuss the strategies they used to work out the original number.