GradeMap

Grade 2 · Math · Unit 3 of 14

Adding to 100

Bigger adding and take-aways

What your child practises

Two-digit adding and subtracting by working with tens and ones, including making a new ten.

Ontario Curriculum expectation: B2.3, B2.4 · adding and subtracting whole numbers to 100

How we explain it

Children can open this short lesson before they practise.

  1. Add the tens first.
  2. Then add the ones.
  3. Put the two answers together. To take away, work the same way.

Example: 34 + 25 = ? Tens: 30 + 20 = 50. Ones: 4 + 5 = 9. 50 + 9 = 59. Answer: 59

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 29 + 47?

    29 + 47 = ?

    • 75
    • 76
    • 80
    Show answer

    76

    Hint: The ones make a new ten! 9 + 7 = 16. So 60 + 16 = 76.

  2. Question 2

    What is 32 + 25?

    32 + 25 = ?

    • 57
    • 47
    • 53
    Show answer

    57

    Hint: Add the tens: 30 + 20 = 50. Add the ones: 2 + 5 = 7. Together: 57.

  3. Question 3

    What is 75 − 60?

    75 − 60 = ?

    • 15
    • 5
    • 21
    Show answer

    15

    Hint: Taking away tens? Only the tens change. 75 take away 6 tens is 15.

  4. Question 4

    What is 57 − 40?

    57 − 40 = ?

    • 15
    • 17
    • 18
    Show answer

    17

    Hint: Take away the tens: 50 − 40 = 10. Take away the ones: 7 − 0 = 7.

  5. Question 5

    What is 11 + 20?

    11 + 20 = ?

    • 27
    • 32
    • 31
    Show answer

    31

    Hint: Adding tens? Only the tens change: 1 tens + 2 tens = 3 tens.

  6. Question 6

    Ollie has 44 blueberries. He picks 25 more. How many blueberries now?

    🫐44 + 25
    • 69
    • 71
    • 65
    Show answer

    69

    Hint: Add them together: 44 + 25. Add the tens, then the ones.

More Grade 2