4th grade · Math · Unit 2 of 15
Add & Subtract
Big numbers, up to 10,000
What your child practices
Adding and subtracting numbers to 10,000 with regrouping, counting up to subtract, estimating by rounding, and solving word problems.
Alabama Course of Study content standard: 4.10 · fluently adding and subtracting multi-digit whole numbers
How we explain it
Children can open this short lesson before they practice.
- Line up the digits by place value.
- Work from the ones to the thousands.
- Regroup when a place has more than 9.
Example: 4,582 + 2,749 = ? Ones: 2 + 9 = 11. Write 1, regroup 1. Tens: 8 + 4 + 1 = 13. Write 3, regroup 1. Hundreds: 5 + 7 + 1 = 13. Write 3, regroup 1. Thousands: 4 + 2 + 1 = 7. Answer: 7,331
Add & Subtract in Alabama
In the Alabama Course of Study, this is unit 2 of 15 in 4th grade Math, after Numbers to 10,000 and before Multiply & Divide.
Gradelings describes a child's practice on this unit as Beginning, Approaching, Meeting or Exceeding (Four practice steps). That reflects practice, not a report-card mark: the teacher decides the mark.
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 7320 − 2072?
7320 − 2072 = ?
- 5148
- 5248
- 5258
- 5352
5248
Hint: Line up the places and start with the ones. If the top digit is too small, regroup 1 from the next place to the left. Check by adding your answer to 2072: you should get 7320.
Question 2
Sam walked 5113 steps before lunch and 1249 steps after lunch. How many steps in all?
👟- 6352
- 6462
- 3864
- 6362
6362
Hint: Put the two amounts together: 5113 + 1249. Add place by place: 5000 + 1000 = 6000, 100 + 200 = 300, 10 + 40 = 50, 3 + 9 = 12. Then add those: 6000 + 300 + 50 + 12.
Question 3
What is 5954 + 2703?
5954 + 2703 = ?
answer box
8657
Hint: Add place by place: 5000 + 2000 = 7000, 900 + 700 = 1600, 50 + 0 = 50, 4 + 3 = 7. Then add those: 7000 + 1600 + 50 + 7.
Question 4
What is 3058 + 2271?
3058 + 2271 = ?
- 5229
- 5339
- 5429
- 5329
5329
Hint: Add place by place: 3000 + 2000 = 5000, 0 + 200 = 200, 50 + 70 = 120, 8 + 1 = 9. Then add those: 5000 + 200 + 120 + 9.
Question 5
A giant puzzle has 6322 pieces. Maya has placed 922 pieces. How many pieces are left?
🧩answer box
5400
Hint: Find the difference: 6322 − 922. Or count up from the smaller number to the bigger one.
Question 6
What number goes in the box?
1695 + = 4200
answer box
2505
Hint: Think: what do you add to 1695 to make 4200? Count up from 1695: +5 → 1700, +300 → 2000, +2200 → 4200. Then add up the jumps: 5 + 300 + 2200.