Mathematics·Addition & Subtraction·procedural
Adding and subtracting tens mentally
Add and subtract a two-digit number and tens mentally and using concrete/pictorial representations
Suggested ages 6–7
Learning journey
Your child is building strong foundations in addition and subtraction — learning to add and subtract numbers fluently within 20, understanding the relationship between these operations, and applying various mental strategies to solve problems.
Evidence of understanding
- Calculate 45 + 30 = 75 mentally
- Calculate 82 − 40 = 42 mentally
- Explain that only the tens digit changes when adding/subtracting tens
Assessment prompt
Can Adding and subtracting tens mentally quickly work out '54 + 30' or '78 − 20' in their head — knowing that only the tens digit changes?
Standards alignment
Maths/Y2/AS/5GB · uk-nc-2013
Add and subtract two-digit numbers and tens
The national curriculum in England: Key stages 1 and 2 framework document · Key Stage 1