A fact family describes a relationship between 3 numbers. The relationship could be through addition or subtraction.
This video shows how we can use fact families to help us answer questions.
We are interested in the fact family of $1$1,$8$8 and $9$9.
$+$+ | $=$= | |||
$8$8 | $+$+ | $1$1 | $=$= | $9$9 |
What is $1+8$1+8?
What is $9-8$9−8?
What is $9-1$9−1?
We are interested in the fact family of $2$2, $4$4 and $6$6:
$-$− | $=$= | |||
$6$6 | $-$− | $4$4 | $=$= | $2$2 |
What is $2+4$2+4?
What is $6-2$6−2?
What is $4+2$4+2?
We are interested in the fact family of $2$2,$4$4 and $6$6:
$+$+ | $=$= | ? | ||
$2$2 | $+$+ | $4$4 | $=$= | ? |
What is $2+4$2+4?
What is $4+2$4+2?
What is $6-4$6−4?
When looking at the answer to $6-2$6−2, is the answer going to be less than $10$10?
Yes
No
What is $6-2$6−2?