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.
Arizona Academic Standards learning standard: 4.NBT.B.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 Arizona
In the Arizona Academic Standards, 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.
Source: Arizona Department of Education
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 9511 − 167?
9511 − 167 = ?
- 9354
- 9344
- 9456
- 9244
9344
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 167: you should get 9511.
Question 2
What is 8711 − 4130?
8711 − 4130 = ?
answer box
4581
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 4130: you should get 8711.
Question 3
Estimate 2855 + 2435 by rounding each number to the nearest thousand.
- 6000
- 7000
- 4000
- 5000
5000
Hint: 2855 rounds to 3000 and 2435 rounds to 2000. 3000 + 2000 = 5000.
Question 4
A concert hall has 6783 seats. 5618 people came to the show. How many seats were empty?
🎵answer box
1165
Hint: Find the difference: 6783 − 5618. Or count up from the smaller number to the bigger one.
Question 5
A plane flew 3509 km on Monday and 1402 km on Tuesday. How far did it fly in both days?
✈️- 2107
- 5011
- 4901
- 4911
4911
Hint: Put the two amounts together: 3509 + 1402. Add place by place: 3000 + 1000 = 4000, 500 + 400 = 900, 9 + 2 = 11. Then add those: 4000 + 900 + 11.
Question 6
What is 6831 + 1378?
6831 + 1378 = ?
answer box
8209
Hint: Add place by place: 6000 + 1000 = 7000, 800 + 300 = 1100, 30 + 70 = 100, 1 + 8 = 9. Then add those: 7000 + 1100 + 100 + 9.