Grade 1 · Math · Unit 5 of 15
Add & Subtract to 50
Solve number stories
What your child practises
Adding and taking away two-digit numbers (totals up to 50) in number stories and equations, and seeing that the two operations undo each other.
Ontario Curriculum expectation: B2.1, B2.4 · adding and subtracting whole numbers that add up to no more than 50
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 12 + 10?
12 + 10 = ?
- 20
- 17
- 22
Show answer
22
Hint: Adding or taking away 10 changes the tens digit by 1.
Question 2
What is 22 + 5?
22 + 5 = ?
- 25
- 37
- 27
Show answer
27
Hint: Add the ones. If you get 10 or more, make a new ten.
Question 3
What is 16 + 6?
16 + 6 = ?
answer box
Show answer
22
Hint: Add the ones. Make a new ten if you need to.
Question 4
Lena has 18 🐥. 6 are given away. How many are left?
18 − 6 = ?
- 22
- 12
- 18
Show answer
12
Hint: Giving away means taking away.
Question 5
What is 41 + 8?
41 + 8 = ?
- 39
- 49
- 48
Show answer
49
Hint: Add the ones. If you get 10 or more, make a new ten.
Question 6
What number is missing?
19 + = 25
- 3
- 9
- 6
Show answer
6
Hint: Think: what do you add to the first number to get the total?