# Addition fact families (a+b=c, c-b=a)

## Interactive practice questions

We are interested in the fact family of $1$1,$8$8 and $9$9.

 $+$+ $=$= $8$8 $+$+ $1$1 $=$= $9$9
a

What is $1+8$1+8?

b

What is $9-8$98?

c

What is $9-1$91?

Easy
Less than a minute

We are interested in the fact family of $4$4,$6$6 and $10$10.

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

We are interested in the fact family of $2$2, $4$4 and $6$6:

### Outcomes

#### NA2-3

Know the basic addition and subtraction facts