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Mathematics
🔢 Mathematics · Addition & Subtraction

Grouping numbers to add

Understand and apply the associative property of addition: when adding three numbers, any two can be added first

Typical age: 67 years

If your child needs to add 3 + 7 + 6, can they spot that adding 3 and 7 first (to make 10) is easier — rather than always working left to right?

0 / 3 mastered

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Addition as …Addition in …Adding Three…