## Year 4 Number and place value Return to Primary Maths Resources

### Teacher resources.

### Student resources.

The forgotten code: a brain teaser

A man wanted to get into his work building, but he had forgotten his code. However, he did remember five clues. These are what those clues were:

- I think of a number. I add 16 and my answer is 36. What was my number?
- I think of a number. I subtract 25 and add 2. My answer is 27, what was my number?
- I think of a number. I add 15 and then multiply by 2. My answer is 32, what was my number?