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.

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Game Objectives

New Maths Curriculum:

Year 2: Add and subtract numbers using concrete objects, pictorial representations, and mentally, including: a two-digit number and ones; a two-digit number and tens; two two-digit numbers;adding three one-digit numbers

Year 3: Add and subtract numbers mentally, including: a three-digit number and ones; a three-digit number and tens; a three-digit number and hundreds

KS2 Primary Framework:

Year 3:

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

Derive and recall all addition and subtraction facts for each number to 20, sums and differences of multiples of 10 and number pairs that total 100 (Block B)

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