Mon Prof Augmenté
Three Groups of Nine Marbles
Age 7 Maths
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On the table there are three little piles of marbles, and each pile holds the same number: nine. When the groups are equal, you don't have to count every marble one at a time. You can add the groups instead: 9 + 9 + 9 = 27. That is exactly what 9 × 3 means, three groups of nine, which makes twenty-seven marbles altogether.
Examples
- You put out three plates and place nine grapes on each one, then count nine, eighteen, twenty-seven instead of counting one by one.
- Three pencil cases each hold nine coloured pencils, so there are twenty-seven pencils in all.
Key takeaways
- Equal groups can be added: 9 + 9 + 9 = 27.
- 9 × 3 means three groups of nine, which is 27.