Number (add/sub)

Hong Kong

Stage 1

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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