Number (add/sub)

Hong Kong

Stage 2

Use the commutative property of addition to fill in the missing number.

$1+9=9$1+9=9$+$+$\editable{}$

Easy

Less than a minute

Use the commutative property of addition to fill in the missing number.

Use the commutative property of addition to fill in the missing number.

Use the commutative property of addition to fill in the missing number.

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