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Year 1 · Addition and subtraction (within 20)
Find and make pairs of numbers that total 20
Definition
Addition combines two or more amounts into a total. Number bonds, column addition and mental strategies all build on the same idea of putting quantities together.
Why Do I Have to Learn This?
Adding is how we put amounts together, from scores in games to coins in your pocket. It is the first tool you reach for in almost every maths problem.
Key Rules:
- 1. Adding can be done in any order: 5 + 3 = 3 + 5.
- 2. Line up the place-value columns and carry when a column passes 9.
- 3. Number bonds to 10 and 20 make bigger additions quick.
Remember:
- •A number line makes adding on visible, count the jumps.
- •Break awkward numbers apart: 47 + 36 is 47 + 30 + 6.
- •Estimate first (round the numbers) so you notice if an answer is wildly off.
Addition
Putting numbers together to find the total. The answer is called the sum.
4 + 3 = 7
Animated Example:
0 + 9 = 9
Free Find and make pairs of numbers that total 20 Worksheet
Download free worksheets and practise today.
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Let’s Practise the Concept
Step 1 of 3
Put them in order
Tap the numbers from smallest to largest.
In order so far: nothing yet