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Grade 1 · Math · Unit 3 of 15

Adding

Put groups together

What your child practises

Adding to 20 with pictures, ten frames, number lines and short stories, using strategies like counting on, doubles and making 10.

Ontario Curriculum expectation: B2.1, B2.3 · adding whole numbers that add up to no more than 20 with mental math

How we explain it

Children can open this short lesson before they practise.

  1. Adding puts groups together.
  2. Start with the bigger number.
  3. Count on the smaller number.

Example: 5 + 3 = ? Start at 5. Count on 3: 6, 7, 8. Answer: 8

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 9 + 2?

    • 11
    • 16
    • 13
    Show answer

    11

    Hint: Count the red dots, then keep counting the blue dots.

  2. Question 2

    Noah has 9 ⭐ and gets 7 more. How many now?

    ⭐9 + 7
    • 20
    • 16
    • 12
    Show answer

    16

    Hint: Make a ten! 9 + 1 = 10, then add 6 more.

  3. Question 3

    What is 10 + 10?

    10 + 10 = ?

    • 15
    • 19
    • 20
    Show answer

    20

    Hint: Doubles! It's like counting 10 two times.

  4. Question 4

    What is 5 + 9?

    5 + 9 = ?

    • 13
    • 9
    • 14
    Show answer

    14

    Hint: Make a ten! 9 + 1 = 10, then add 4 more.

  5. Question 5

    What is 8 + 5?

    8 + 5 = ?

    • 14
    • 13
    • 10
    Show answer

    13

    Hint: Make a ten! 8 + 2 = 10, then add 3 more.

  6. Question 6

    Ravi has 6 ⭐ and gets 2 more. How many now?

    ⭐6 + 2
    • 8
    • 14
    • 3
    Show answer

    8

    Hint: Start at 6 and count up 2 more.

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