## Difference using an unmarked number line

Find the difference between two numbers by counting on from the smaller number to the larger number. Children must add the fewest numbers possible, so are encouraged to develop more efficient mental methods. The addition is also shown as jumps on a number line.

Levels include counting up to 10, 20, 50 or 100, finding the difference between 2-digit numbers, 3-digit numbers and decimals.

### Game Objectives

**New Maths Curriculum:**

**KS2 Primary Framework:**

Year 3:

Children **use their knowledge of number pairs** for 10 and 20 to **add and subtract efficiently** (Block A)

Year 4:

Add or subtract mentally pairs of two-digit whole numbers (Block A)

Year 5:

Use efficient written methods to add and subtract whole numbers and decimals with up to two places