Number (add/sub)
Hong Kong
Stage 1
Patterns in addition and subtraction I
Interactive practice questions
$12+13=25$12+13=25
Use this to find:
a
$12+23=\editable{}$12+23=
b
$12+33=\editable{}$12+33=
c
$12+43=\editable{}$12+43=
d
$12+73=\editable{}$12+73=
Easy
1min
Use what you know about subtracting to find:
Easy
1min
$11+25=36$11+25=36
Use this to find:
Easy
1min
We know that $38-25=13$38−25=13.
Use this to find:
Easy
1min
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