Grade 2 · Math · Unit 4 of 9
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.
New Brunswick Curriculum skill descriptor: Number: Operations · adding and subtracting numbers to 100
How we explain it
Children can open this short lesson before they practise.
- Add the tens first.
- Then add the ones.
- 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.
Question 1
What is 29 + 47?
29 + 47 = ?
- 75
- 76
- 80
76
Hint: The ones make a new ten! 9 + 7 = 16. So 60 + 16 = 76.
Question 2
What is 32 + 25?
32 + 25 = ?
- 57
- 47
- 53
57
Hint: Add the tens: 30 + 20 = 50. Add the ones: 2 + 5 = 7. Together: 57.
Question 3
What is 75 − 60?
75 − 60 = ?
- 15
- 5
- 21
15
Hint: Taking away tens? Only the tens change. 75 take away 6 tens is 15.
Question 4
What is 57 − 40?
57 − 40 = ?
- 15
- 17
- 18
17
Hint: Take away the tens: 50 − 40 = 10. Take away the ones: 7 − 0 = 7.
Question 5
What is 11 + 20?
11 + 20 = ?
- 27
- 32
- 31
31
Hint: Adding tens? Only the tens change: 1 tens + 2 tens = 3 tens.
Question 6
Ollie has 44 blueberries. He picks 25 more. How many blueberries now?
🫐44 + 25- 69
- 71
- 65
69
Hint: Add them together: 44 + 25. Add the tens, then the ones.