4th grade · Math · Unit 2 of 17
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.
New York State Learning Standards learning standard: NY-4.NBT.4 · 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 New York
In the New York State Learning Standards, this is unit 2 of 17 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 4418 + 1028?
4418 + 1028 = ?
- 5446
- 5346
- 5456
- 5436
5446
Hint: Add place by place: 4000 + 1000 = 5000, 400 + 0 = 400, 10 + 20 = 30, 8 + 8 = 16. Then add those: 5000 + 400 + 30 + 16.
Question 2
Estimate 3406 + 2007 by rounding each number to the nearest thousand.
- 6000
- 7000
- 4000
- 5000
5000
Hint: 3406 rounds to 3000 and 2007 rounds to 2000. 3000 + 2000 = 5000.
Question 3
A library has 4575 books. It gets 389 new books. How many books does it have now?
📚- 5064
- 4964
- 4954
- 4854
4964
Hint: Put the two amounts together: 4575 + 389. Add place by place: 4000 + 0 = 4000, 500 + 300 = 800, 70 + 80 = 150, 5 + 9 = 14. Then add those: 4000 + 800 + 150 + 14.
Question 4
What is 3316 + 911?
3316 + 911 = ?
answer box
4227
Hint: Add place by place: 3000 + 0 = 3000, 300 + 900 = 1200, 10 + 10 = 20, 6 + 1 = 7. Then add those: 3000 + 1200 + 20 + 7.
Question 5
What is 2730 − 218?
2730 − 218 = ?
- 2412
- 2528
- 2512
- 2522
2512
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 218: you should get 2730.
Question 6
A giant puzzle has 7008 pieces. Priya has placed 6882 pieces. How many pieces are left?
🧩answer box
126
Hint: Find the difference: 7008 − 6882. Or count up from the smaller number to the bigger one.