🔢 Mathematics · Counting & Cardinality

One More Each Time

Each successive counting number represents a quantity that is one larger than the previous number

Typical age: 4–6 years

“If your child has 5 stickers and you give them one more, do they know immediately there are now 6 — without needing to count all of them again from one?”

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Needs first

How Many in Total?REQUIRED
Understanding 'one more/one less' requires understanding that each number represents a quantity (cardinality)

Unlocks next

10 More or 10 Less
10 more/less generalises the concept of one more/one less to tens
Addition and subtraction strategiesREQUIRED
Counting on/back relies on understanding that each successive number is one more/less
Finding efficient methods
The +1 pattern in counting is the earliest repeated reasoning