Using the fact family of $4$4, $4$4, and $8$8.

$+$+ | $=$= | |||

$4$4 | $+$+ | $4$4 | $=$= | $8$8 |

What is $8-4$8−4?

Easy

Less than a minute

Using the fact family of $9$9, $9$9, and $18$18:

We are interested in the fact family of $5$5, $5$5, and $10$10:

Using the fact family of $2$2, $5$5, and $7$7.

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