Why number bonds matter
Knowing that 8 and 2 make 10 is the key to adding 8 + 5 in your head: 8 + 2 + 3. Bonds and fact families make that connection visible.Irish curriculum links
- InfantsStage 1 Sets and operations: children see what happens when a quantity is split and joined, the part-part-whole idea behind a number bond.
- 1st–2nd ClassAt Stage 2 the toolkit describes a number fact as a mental picture of a number and its parts, and has children use known facts, like doubles, to find new ones.
- InverseFact families show that addition and subtraction undo each other, a Stage 1 concept in the toolkit.
Irish infant classes usually build bonds with real objects first: cubes in two colours, or counters hidden under a cup (“there were 7, I can see 4, how many are hiding?”). The sheet comes after, as a record of what children can already do with their hands.
Bonds to 10 matter most. They turn 8 + 5 into 8 + 2 + 3, and later they help with change: from €10, something costing €7 leaves €3.
Summarised in our own words from the Primary Mathematics Curriculum (2023) and the NCCA Mathematics Toolkit.
