Number (add/sub)
Hong Kong
Stage 1
Add and subtract three digit numbers II
Interactive practice questions
Evaluate $605+305$605+305 by doing the following.
a
Fill in the box with the missing number.
$605=600+\editable{}$605=600+
b
Fill in the box with the missing number.
$305=\editable{}+5$305=+5
c
Using the answers from the previous parts, solve $605+305$605+305.
Easy
< 1min
Evaluate $306+604$306+604 by doing the following.
Easy
< 1min
Using the fact that $201=200+1$201=200+1 and $309=300+9$309=300+9, evaluate $201+309$201+309.
Easy
< 1min
Using the fact that $250=200+50$250=200+50 and $350=300+50$350=300+50, evaluate $250+350$250+350.
Easy
< 1min
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