Add and Subtract to 20Grade 1 Math for Kids

Doubles, number line hops and missing numbers up to 20.

Add and Subtract to 20 gives first graders smart strategies instead of finger counting: doubles, making ten, hopping on a number line and using addition to subtract. These are the strategies teachers use to build fluency within 20.

  • Grade 1 · Ages 6–7
  • 1 lesson
  • 4 games
  • 32 practice questions
  • About 15 min
Start Learning Free Open the Course
  • Learn it
  • Doubles
  • Hop to Add
  • Subtract from 20
  • Missing Numbers

Math course · Grade 1

Add and Subtract to 20 · Learning goals

What Your Child Will Learn

Use smart strategies to add and subtract within 20: doubles, making ten, hopping on a number line and thinking addition to subtract.

  • Doubles
  • Hop to Add
  • Subtract from 20
  • Missing Numbers

Why it matters

Why This Matters for Kids

  • Strategies beat counting

    Doubles and making ten let kids solve 8 + 7 in their heads, which is faster and more accurate than counting on fingers.

  • A grade 1 milestone

    Adding and subtracting within 20 is one of the main goals of first grade math in most curricula.

  • Flexible thinkers

    Choosing a strategy teaches kids that there's more than one way to solve a problem, a habit that helps in every subject.

Inside Add and Subtract to 20

How the Course Works

A short read-aloud lesson first, then hands-on games and a quiz to lock it in.

  1. Step 1 · Lesson

    Learn it

    A short read-aloud lesson in 5 steps, with pictures and worked examples.

  2. Step 2 · Game

    Doubles

    Add a number to itself. Doubles are easy! (8 problems)

  3. Step 3 · Game

    Hop to Add

    Start at the green dot and hop forward. Where do you land? (8 problems)

  4. Step 4 · Game

    Subtract from 20

    Take away the crossed-out dots. How many are left? (8 problems)

  5. Step 5 · Game

    Missing Numbers

    What number is hiding? Think: plus what makes the total? (8 problems)

Lesson preview

A Peek Inside the Lesson

This is the real lesson text your child hears, read aloud by a friendly voice.

Doubles are a number added to itself. 6 + 6 = 12. Doubles are easy to remember!

Near doubles: 6 + 7 is just one more than 6 + 6. So 6 + 7 = 13!

Make a ten to add fast. 9 + 4: move 1 over to make 10, then add the 3 that are left. 13!

On a number line, hop forward to add. Start at 9 and hop 4. You land on 13!

To subtract, think addition. For 15 − 7, ask: 7 plus what makes 15? The answer is 8!

For parents

Try It at Home

Learning sticks best when kids use it in real life. Here are simple ideas from this course.

Parent Tip

Roll two dice and add them. When you roll doubles, say them out loud together: "Double 6 is 12!" Then try one more than a double, like 6 + 7.

Practice

Grade 1 Math Practice Questions

Real questions from Add and Subtract to 20. Try them with your child, then tap to see the answer.

  1. Question 1

    8 + 8 = ?

    Show answer

    16

  2. Question 2

    7 + 6 = ?

    Show answer

    13

  3. Question 3

    18 − 9 = ?

    Show answer

    9

The full course has 32 questions with instant feedback, stars and rewards. Create a free account to play them all.

Add and Subtract to 20 · Questions from parents

Frequently Asked Questions

What age is this course for?

Add and Subtract to 20 is a grade 1 math course for kids ages 6–7. That is Year 2 maths in the UK and Year 1 in Australia. It also works well for review in the next grade, or as a challenge for a confident younger learner.

What will my child learn?

Use smart strategies to add and subtract within 20: doubles, making ten, hopping on a number line and thinking addition to subtract. Along the way they practice: Doubles; Hop to Add; Subtract from 20; Missing Numbers.

How long does the course take?

About 15 minutes in total, split into 4 short levels. Most kids finish it over two or three sessions. Progress is saved, so they can stop any time and pick up where they left off.

Is this course free?

Add and Subtract to 20 is part of SkillBloom Premium, which unlocks every course in every subject. Each subject also has free courses, so your child can try SkillBloom before you decide.

Does my child need to read well to use it?

No. Every lesson has a friendly read-aloud voice, questions are read aloud too, and the pictures help kids follow along. Confident readers can turn the voice off.

Can we use it for homeschool?

Yes. SkillBloom is built for homeschooling families. Kids work through lessons, games and quizzes on their own, and the parent dashboard shows what they finished and which skills need more practice. It works on phones, tablets and laptops.

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