Number (add/sub)
Hong Kong
Stage 1
Patterns in addition
Interactive practice questions
Use what you know about addition to find:
a
$5+4=\editable{}$5+4=
b
We know that:
$5+4=9$5+4=9.
Use this to find:
$15+4=\editable{}$15+4=
c
We know that
$5+4=9$5+4=9.
Use this to find:
$5+14=\editable{}$5+14=
Easy
< 1min
$17+2=19$17+2=19
Use this to find:
Easy
< 1min
$3+15=18$3+15=18
Use this to find:
Easy
< 1min
Fill in the boxes with the missing numbers.
Easy
< 1min
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