Number (add/sub)
Hong Kong
Stage 1
Strategy - Compensation (single and double digit)
Interactive practice questions
If $6+10=16$6+10=16, what is the answer to $6+8$6+8?
Easy
< 1min
If $7+10=17$7+10=17, what is the answer to $7+11$7+11?
Easy
< 1min
If $10-5=5$10−5=5, what is the answer to $11-5$11−5?
Easy
< 1min
If $10-7=3$10−7=3, what is the answer to $9-7$9−7?
Easy
< 1min
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