Free course · Ages 4–6

Bubble Subtraction Bay

Pop bubbles and count back to master subtraction within 20 by the sunny bay.

2 interactive lessons · Play at your own pace

No subscription needed to practise. Sign in to save progress.

What your child will practise

  • Take away objects and work out how many remain.

Start together, let your child explain their thinking, and repeat a lesson when they want more practice.

Inside this course

  1. Lesson 1

    Bubble Pop Takeaway

    Pop bubbles to subtract within 10!

    13 practice questions

  2. Lesson 2

    Bay Shore Subtract

    Subtract shells and crabs within 20!

    13 practice questions

Try a worked example

5 apples - 2 apples = ?

5 - 2 = 3!

Answer: 3

How to help at home

  • subtraction: Set out the starting amount, take the second number away one piece at a time, and count what is left before checking the answer.

Sample questions

A taste of what each lesson asks. Every question can be read aloud with Hear It, and the answer is revealed when your child answers.

Bubble Pop Takeaway

  • 5 apples - 2 apples = ?
  • Dino Dave had 6 balloons. 1 went away. How many left?
  • Take away 3 from 7. What is left?

Bay Shore Subtract

  • 12 apples - 3 apples = ?
  • Dino Dave had 14 bubbles. 5 went away. How many left?
  • Take away 4 from 11. What is left?

Common questions

Is this course really free?

Yes. Every lesson in Bubble Subtraction Bay is free to play in the browser. Math Pals Pro unlocks the paid courses and Innov8 AI Intelligence hints, but is not needed here.

Do I need an account?

No account is needed to practise. Sign in with Google to save progress, badges and scorecards for each child.

What age is it for?

Bubble Subtraction Bay is pitched at ages 4–6. Younger or older children can still enjoy it; the age range shows where the questions sit.

Does it work on a phone or tablet?

Yes. Lessons run in any modern browser and scale to fit phones, tablets and laptops.