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Grade 2 · Math · Unit 3 of 10

Facts to 20

Add and take away

What your child practises

Fluent facts to 20 using strategies like making ten and thinking addition to subtract.

BC Curriculum learning standard: Addition and subtraction facts to 20 (emerging computational fluency); change in quantity to 20

How we explain it

Children can open this short lesson before they practise.

  1. Use 10 as a stepping stone.
  2. Break one number to make a 10 with the other.
  3. Then add what is left over.

Example: 8 + 5 = ? 8 needs 2 more to make 10. Take 2 from 5. That leaves 3. 10 + 3 = 13. Answer: 13

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

    What is 14 − 9?

    14 − 9 = ?

    • 5
    • 0
    • 11
    Show answer

    5

    Hint: Think addition: 9 + ? = 14. Or start at 14 and count back 9.

  2. Question 2

    What is 9 − 5?

    9 − 5 = ?

    • 1
    • 4
    • 3
    Show answer

    4

    Hint: Think addition: 5 + ? = 9. Or start at 9 and count back 5.

  3. Question 3

    What is 5 + 2?

    • 5
    • 7
    • 8
    Show answer

    7

    Hint: Start at 5 and count up 2 more.

  4. Question 4

    What number is missing?

    4 + = 16

    • 18
    • 12
    • 10
    Show answer

    12

    Hint: Count up from 4 to 16. How many jumps did you make?

  5. Question 5

    What is 8 + 9?

    8 + 9 = ?

    • 18
    • 20
    • 17
    Show answer

    17

    Hint: Make a ten! 8 + 2 = 10, then add 7 more to get 17.

  6. Question 6

    What is 5 + 4?

    5 + 4 = ?

    • 12
    • 9
    • 11
    Show answer

    9

    Hint: Start at 5 and count up 4 more.

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