Grade 3 · Math · Unit 2 of 13
Add & Subtract
Bigger numbers to 1000
What your child practises
Adding and subtracting 2- and 3-digit numbers by place value, number-line jumps and counting up, plus estimating by rounding to the nearest hundred.
New Brunswick Curriculum skill descriptor: Number: Operations · adding and subtracting 2- and 3-digit numbers, with mental math and estimation
How we explain it
Children can open this short lesson before they practise.
- Line up the ones, tens and hundreds.
- Start with the ones, then tens, then hundreds.
- If a place goes over 9 when adding, regroup to the next place.
Example: 276 + 148 = ? Ones: 6 + 8 = 14. Write 4 and regroup 1 ten. Tens: 7 + 4 + 1 = 12. Write 2 and regroup 1 hundred. Hundreds: 2 + 1 + 1 = 4. Answer: 424
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
About how much is 595 + 193?
- 900
- 1000
- 700
- 800
800
Hint: Round each number to the nearest hundred: 595 is close to 600 and 193 is close to 200. 600 + 200 = 800.
Question 2
A tree farm had 590 trees. It sold 506 trees. How many trees are left?
🌲- 94
- 84
- 74
- 96
84
Hint: Take away to find what's left: 590 − 506. Count up from 506 to 590: +4, +80. Add the jumps: 4 + 80 = 84.
Question 3
What is 512 + 48?
512 + 48 = ?
- 660
- 550
- 560
- 570
560
Hint: Add each place: hundreds 500, tens 10 + 40 = 50, ones 2 + 8 = 10. Then 500 + 50 + 10 = 560.
Question 4
A farm stand sold 417 apples on Saturday and 364 apples on Sunday. How many apples were sold in all?
🍎answer box
781
Hint: Put them together: 417 + 364. Add each place: hundreds 400 + 300 = 700, tens 10 + 60 = 70, ones 7 + 4 = 11. Then 700 + 70 + 11 = 781.
Question 5
What is 658 + 51?
658 + 51 = ?
answer box
709
Hint: Add each place: hundreds 600, tens 50 + 50 = 100, ones 8 + 1 = 9. Then 600 + 100 + 9 = 709.
Question 6
What is 996 − 160? Use the jumps.
- 846
- 836
- 936
- 826
836
Hint: Jump back 100 from 996 to 896, then jump back 60 to 836.