Mental maths in grades 1 to 4

Maths is more than speed

Mental maths shows how numbers relate. A good question is therefore not only “What is it?” but also “How did you start?” The answer makes strategies visible and gives you a starting point for the next practice step.

For parents: speed is not the goal. A task is understood when your child can describe a coherent route, even if the calculation still takes a moment.

Vary by grade without overdoing it

Grades 1,2 suit small amounts, doubling, splitting and complements to 20. Phrases like “8 is 5 and 3” help structure numbers. Grades 3,4 add estimation, written-linked strategies and multiplication. The numbers in the examples are suggestions, not a diagnosis.

Many curricula distinguish between executing a procedure and understanding operative relationships, that distinction helps at home: one practised strategy is worth more than ten randomly solved tasks.

Four strategies you can show at home

1. Stepwise: 47 + 26 as 47 + 20 + 6.
2. Split place values: 47 + 26 as 40 + 20 and 7 + 6, then combine.
3. Helper task: 64 − 19 as 64 − 20 + 1.
4. Neighbour task: 6 × 8 as 6 × 5 + 6 × 3, use the 5s row as an anchor.

Compare two routes: “Which was easier to explain today?” Your child learns to choose among routes instead of just delivering answers.

Try: two routes for one task

Solve 47 + 26 together two ways. One is 47 + 20 + 6, the other 50 + 20 + 3. Note both briefly and ask: where did you have to think least? Recheneule can offer an extra short round afterwards, as a voluntary repetition, not an assessment.