Number (add/sub)
Hong Kong
Stage 2
Properties of addition and subtraction
Interactive practice questions
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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