Fact family

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 complete a fact family with addition and subtraction?

Back

To complete a fact family, you can derive all possible addition and subtraction sentences using the same three numbers.

Front

Given the numbers 2, 8, and 10, what are the addition and subtraction sentences in the fact family?

Back

The sentences are: 2 + 8 = 10, 8 + 2 = 10, 10 - 2 = 8, 10 - 8 = 2.

Front

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

Back

Addition and subtraction are inverse operations; knowing one allows you to find the other.

Front

How can you identify the missing fact in a fact family?

Back

You can identify the missing fact by using the known facts and applying the inverse operation.

Front

What is the fact family for the numbers 9, 1, and 10?

Back

The fact family includes: 9 + 1 = 10, 1 + 9 = 10, 10 - 1 = 9, 10 - 9 = 1.

Front

If you know 5 + 3 = 8, what other sentences are part of its fact family?

Back

The other sentences are: 3 + 5 = 8, 8 - 3 = 5, 8 - 5 = 3.

Front

What is the fact family for the numbers 7, 3, and 10?

Back

The fact family includes: 7 + 3 = 10, 3 + 7 = 10, 10 - 3 = 7, 10 - 7 = 3.

Front

How do you derive a subtraction sentence from an addition sentence?

Back

To derive a subtraction sentence, take the sum and subtract one of the addends.

Front

What is the fact family for the numbers 10, 6, and 16?

Back

The fact family includes: 10 + 6 = 16, 6 + 10 = 16, 16 - 10 = 6, 16 - 6 = 10.