Addition and Subtraction

NZ Level 2

Patterns in addition II

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

Less than a minute

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Know how many ones, tens, and hundreds are in whole numbers to at least 1000.

Generalise that whole numbers can be partitioned in many ways