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Patterns in addition I

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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