MyMathKidK-8 Curriculum

Grade 1 Mental Math Worksheets

Master mental math step by step, from basic concepts to advanced problem solving

Common Core: 1.NBT

Watch & Learn

Learning Path

Start with Lesson 1 and work your way through!

1

Make 10 Strategy

Beginner

Learn to add numbers by making 10 first

Understand the make 10 strategyBreak apart numbers to make 10+1 more
2

Doubles Facts

Beginner

Learn doubles facts for quick mental math

Memorize doubles facts to 10Recognize doubles problems quickly+1 more
3

Doubles Plus One

Easy

Use doubles to solve near-doubles problems

Recognize near-doubles problemsUse doubles facts to solve doubles plus one+1 more
4

Break Apart Strategy

Easy

Break larger numbers into tens and ones

Break numbers into tens and onesAdd tens first, then ones+1 more
5

Mixed Mental Math Strategies

Easy

Practice choosing the best strategy

Choose the best strategy for each problemApply all mental math strategies+1 more

How to solve Grade 1 mental math problems

Real problems from these worksheets, solved one step at a time — the same explanations your child sees when practicing online.

  1. Example 1

    9 + 5 = ?

    1. 9 needs 1 more to make 10.
    2. Split 5 into 1 and 4.
    3. 9 + 1 = 10.
    4. 10 + 4 = 14.

    Answer: 14

  2. Example 2

    3 + 2 = ?

    1. Start at 3 on the number line.
    2. Count forward 2 steps.
    3. You land on 5.

    Answer: 5

  3. Example 3

    2 + 2 = ?

    1. Start at 2 on the number line.
    2. Count forward 2 steps.
    3. You land on 4.

    Answer: 4

Frequently Asked Questions

Are these Grade 1 Mental Math worksheets free?
All printable Mental Math worksheets on MyMathKid are free to download and print. Answer keys are a premium feature available with a subscription.
How many Mental Math worksheets are available for Grade 1?
There are 5 progressive Mental Math lessons with worksheets for Grade 1, covering skills from foundational concepts to advanced problem solving.
Are these Mental Math worksheets aligned to Common Core?
Yes — Grade 1 Mental Math aligns with Common Core 1.NBT (Number & Operations in Base Ten).
What will my child practice with these Mental Math worksheets?
Your child will practice: Make 10 Strategy, Doubles Facts, Doubles Plus One, Break Apart Strategy, and more.