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Grade 1 · Math · Unit 4 of 15

Take Away

How many are left?

What your child practises

Subtracting within 20 by counting back and thinking addition, and solving short take-away and compare stories.

Ontario Curriculum expectation: B2.1–B2.3 · taking away within 20 and the link between adding and taking away

How we explain it

Children can open this short lesson before they practise.

  1. Taking away means some go away.
  2. Start with the whole group.
  3. Count back the number you take away.

Example: 9 − 4 = ? Start at 9. Count back 4: 8, 7, 6, 5. Answer: 5

Sample questions

A taste of this unit. In the app, questions change every time and get easier or harder to match your child.

  1. Question 1

    3 + 7 = 10. So what is 10 − 7?

    10 − 7 = ?

    • 0
    • 3
    • 8
    Show answer

    3

    Hint: Adding and taking away are a team. Use the adding fact to help!

  2. Question 2

    Start at 8. Hop back 2. Where do you land?

    039121518?
    • 6
    • 0
    • 11
    Show answer

    6

    Hint: Put your finger on 8. Move back one number for each hop.

  3. Question 3

    There are 19 🐞 on a leaf. 4 crawl away. How many are left?

    🐞19 − 4
    • 17
    • 15
    • 16
    Show answer

    15

    Hint: Take away from the ones. The ten stays!

  4. Question 4

    Lena had 8 🍓 and ate 6. How many are left?

    🍓🍓❌❌❌❌❌❌
    • 0
    • 5
    • 2
    Show answer

    2

    Hint: Each X shows one that was eaten. Count the ones still there.

  5. Question 5

    What is 20 − 3?

    20 − 3 = ?

    • 17
    • 14
    • 18
    Show answer

    17

    Hint: Think of 20 as 10 and 10. Take 3 away from one of the tens.

  6. Question 6

    There are 17 🐦 in a tree. 8 fly away. How many are left?

    🐦17 − 8
    • 4
    • 9
    • 6
    Show answer

    9

    Hint: Take away 7 to get to 10, then take away 1 more.

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