4.01 Relate addition and subtraction
Interactive practice questions
Using the fact family of $9$9, $9$9, and $18$18.
 |
$+$+ |  |
$=$= |  |
| $9$9 | $+$+ | $9$9 | $=$= | $18$18 |
What is $18-9$18−9?
Easy
< 1min
Using the fact family of $6$6, $6$6, and $12$12:
Easy
< 1min
Using the fact family of $8$8, $7$7, and $15$15.
Easy
1min
Using the fact family of $5$5, $9$9, and $14$14:
Easy
1min
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