Select all of the number pairs that add to $10$10.

$8$8 and $2$2

A

$5$5 and $5$5

B

$3$3 and $7$7

C

$4$4 and $6$6

D

Easy

Less than a minute

How many more do we need to add to $1$1 to get to $10$10?

How many more do we need to add to $9$9 to get to $10$10?

How many more do we need to add to $14$14 to get to $20$20?

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uses mental and written strategies for addition and subtraction involving two-, three-, four and five-digit numbers