The task involves solving addition and subtraction problems with 4-digit and 3-digit numbers without regrouping. Let's solve each problem step by step.
---
Problem 1:
$$
1620 + 260
$$
- Add the digits in each column from right to left:
- Ones place: \(0 + 0 = 0\)
- Tens place: \(2 + 6 = 8\)
- Hundreds place: \(6 + 2 = 8\)
- Thousands place: \(1 + 0 = 1\)
$$
1620 + 260 = 1880
$$
---
Problem 2:
$$
2233 + 110
$$
- Add the digits in each column from right to left:
- Ones place: \(3 + 0 = 3\)
- Tens place: \(3 + 1 = 4\)
- Hundreds place: \(2 + 1 = 3\)
- Thousands place: \(2 + 0 = 2\)
$$
2233 + 110 = 2343
$$
---
Problem 3:
$$
8114 + 254
$$
- Add the digits in each column from right to left:
- Ones place: \(4 + 4 = 8\)
- Tens place: \(1 + 5 = 6\)
- Hundreds place: \(1 + 2 = 3\)
- Thousands place: \(8 + 0 = 8\)
$$
8114 + 254 = 8368
$$
---
Problem 4:
$$
2185 + 302
$$
- Add the digits in each column from right to left:
- Ones place: \(5 + 2 = 7\)
- Tens place: \(8 + 0 = 8\)
- Hundreds place: \(1 + 3 = 4\)
- Thousands place: \(2 + 0 = 2\)
$$
2185 + 302 = 2487
$$
---
Problem 5:
$$
6968 - 753
$$
- Subtract the digits in each column from right to left:
- Ones place: \(8 - 3 = 5\)
- Tens place: \(6 - 5 = 1\)
- Hundreds place: \(9 - 7 = 2\)
- Thousands place: \(6 - 0 = 6\)
$$
6968 - 753 = 6215
$$
---
Problem 6:
$$
3985 - 783
$$
- Subtract the digits in each column from right to left:
- Ones place: \(5 - 3 = 2\)
- Tens place: \(8 - 8 = 0\)
- Hundreds place: \(9 - 7 = 2\)
- Thousands place: \(3 - 0 = 3\)
$$
3985 - 783 = 3202
$$
---
Problem 7:
$$
6679 - 318
$$
- Subtract the digits in each column from right to left:
- Ones place: \(9 - 8 = 1\)
- Tens place: \(7 - 1 = 6\)
- Hundreds place: \(6 - 3 = 3\)
- Thousands place: \(6 - 0 = 6\)
$$
6679 - 318 = 6361
$$
---
Problem 8:
$$
6769 - 522
$$
- Subtract the digits in each column from right to left:
- Ones place: \(9 - 2 = 7\)
- Tens place: \(6 - 2 = 4\)
- Hundreds place: \(7 - 5 = 2\)
- Thousands place: \(6 - 0 = 6\)
$$
6769 - 522 = 6247
$$
---
Problem 9:
$$
6925 - 401
$$
- Subtract the digits in each column from right to left:
- Ones place: \(5 - 1 = 4\)
- Tens place: \(2 - 0 = 2\)
- Hundreds place: \(9 - 4 = 5\)
- Thousands place: \(6 - 0 = 6\)
$$
6925 - 401 = 6524
$$
---
Final Answers:
$$
\boxed{
1880, 2343, 8368, 2487, 6215, 3202, 6361, 6247, 6524
}
$$
Parent Tip: Review the logic above to help your child master the concept of subtraction worksheet on a.
