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First Grade

Common Core for Grade 1

Math Worksheets

Videos, examples, solutions, and songs to help Kindergarten and Grade 1 kids learn the Fact Families.

Fact Families will help students to apply properties of operations as strategies to add and subtract.

*Examples:
If 8 + 3 = 11 is known, then 3 + 8 = 11 is also known. (Commutative property of addition.)
To add 2 + 6 + 4, the second two numbers can be added to make a ten, so 2 + 6 + 4 = 2 + 10 = 12. (Associative property of addition.)*

Understand subtraction as an unknown-addend problem.

*For example, subtract 10 – 8 by finding the number that makes 10 when added to 8.*

Common Core: 1.OA.4

- I can use properties of operations to add and subtract.
- I can give an example and explain how a subtraction equation can be rewritten as an addition equation.
- I can rewrite a subtraction equation as an addition equation with a missing addend.
- I can connect addition to subtraction (Inverse Operation)
- I can apply the strategy to think addition rather than take away:

Rather than 9 - 6 = ___ ask how many would you add to six to equal nine? - I can use concrete models with manipulatives to find the unknown

The following diagram shows an example of fact family using fact triangles, part-part-whole and number bond. Scroll down the page for more examples and solutions.

**Fact Family, Fact Triangle and Number Bond**

**Fact Families and Fact Triangles**

How to solving addition and subtraction fact families when all three numbers are given?

How to solving addition and subtraction fact families when there is a missing addend or sum?

Examples:

13, 8 and 5;

11, 7 and 4;

16, 9 and 7.

**Examples:**

Break the total into parts. Write a number bond and addition and subtraction number sentences to match the story.

- Rachel and Lucy are playing with 5 trucks. If Rachel is playing with 2 of them, how many is Lucy playing with?

- Jane caught 9 fish at the end of the day. She caught 7 fish before she ate lunch. How many fish did she catch after lunch?

- Dad bought 6 shirts. The next day he returned some of them. Now he has 2 shirts. How many shirts did Dad return?

**Fact Family using Part-Part Whole Model**

Example:

3, 4, and 7 (Addition and subtraction).

**Fact Family Song**

This song helps children understand fact family for addition and subtraction.

**Fact Families and Fact Triangles**

Learn about fact families and fact triangles for subtraction.

Examples:

- Write a fact family for the group of numbers.

8, 7, 15 - Complete the Fact Triangle and write the fact family.

**Want to help your first grade child with their math lessons?**

Teach your child the fact families.

Try the free Mathway calculator and
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