+/- Fact Families

Front

What is a fact family in mathematics?

Back

A fact family is a group of related addition and subtraction or multiplication and division facts that use the same numbers.

Front

How do you identify the missing number in a fact family?

Back

To identify the missing number in a fact family, you can use the known facts to perform the necessary operations (addition or subtraction) to find the unknown.

Front

What is the relationship between addition and subtraction in a fact family?

Back

In a fact family, addition and subtraction are inverse operations; knowing one allows you to find the other.

Front

What is the relationship between multiplication and division in a fact family?

Back

In a fact family, multiplication and division are inverse operations; knowing one allows you to find the other.

Front

If 9 + 1 = 10, what are the related subtraction facts?

Back

The related subtraction facts are 10 - 1 = 9 and 10 - 9 = 1.

Front

How can you complete a fact family if given one addition fact?

Back

You can complete a fact family by using the sum and the addends to create the related subtraction facts.

Front

What is the sum of 9 and 9?

Back

The sum of 9 and 9 is 18.

Front

If you know that 7 + 7 = 14, what is the related subtraction fact?

Back

The related subtraction fact is 14 - 7 = 7.

Front

What is the missing number in the equation 9 + ______ = 18?

Back

The missing number is 9.

Front

How do you find the missing addition fact in a fact family?

Back

You can find the missing addition fact by using the known sum and one of the addends.