Number (add/sub)
Hong Kong
Stage 1
Patterns in addition II
Interactive practice questions
Use what you know about addition to find:
a
$9+2=\editable{}$9+2=
b
We know that:
$9+2=11$9+2=11.
Use this to find:
$19+2=\editable{}$19+2=
c
We know that
$9+2=11$9+2=11.
Use this to find:
$9+12=\editable{}$9+12=
Easy
< 1min
$19+2=21$19+2=21. Use this to find:
Easy
< 1min
$2+19=21$2+19=21. Use this to find:
Easy
< 1min
Fill in the boxes with the missing numbers.
Easy
< 1min
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