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If you know that...
4 x 5 = 20
...what division problem do you also know the answer to?
"Inverse" is a fancy word for opposite.
Inverse operations are operations that "undo" each other. They are partners.
is the inverse of
is the inverse of
A fact family is a group of four math facts that all use the same three numbers. It shows the inverse relationship between multiplication and division.
Multiplication:
3 x 4 = 12
Multiplication:
4 x 3 = 12
Division:
12 ÷ 3 = 4
Division:
12 ÷ 4 = 3
Notice how division always starts with the biggest number!
What is the fact family for the numbers 6, 7, and 42?
1. 6 x 7 = 42
2. 7 x 6 = 42
3. 42 ÷ 6 = 7
4. 42 ÷ 7 = 6
Which number is missing from this family? 2, 8, __
2 x 8 = ?
Write one multiplication and one division fact for:
5, 7, 35
Write the full fact family for:
6, 8, 48
You are given one fact from a family:
9 x 4 = 36
On a piece of paper, write the other three facts in this family.