Let's solve each of the mixed addition and subtraction problems step by step. These are all 3-digit numbers, and we'll perform the operations as indicated.
---
Row 1:
1.
206 + 12
= 218
2.
329 + 325
= 654
3.
810 + 65
= 875
4.
355 - 121
= 234
5.
157 - 96
= 61
---
Row 2:
6.
687 - 390
= 297
7.
632 - 65
= 567
8.
978 + 979
= 1957
9.
785 - 465
= 320
10.
429 - 215
= 214
---
Row 3:
11.
504 - 272
= 232
12.
988 + 228
= 1216
13.
880 + 45
= 925
14.
159 + 27
= 186
15.
398 - 73
= 325
---
Row 4:
16.
974 - 914
= 60
17.
251 + 57
= 308
18.
143 - 73
= 70
19.
674 + 86
= 760
20.
224 - 10
= 214
---
Row 5:
21.
661 + 680
= 1341
22.
327 + 859
= 1186
23.
269 - 132
= 137
24.
665 + 932
= 1597
25.
482 + 21
= 503
---
✔ Final Answers (in order):
```
218, 654, 875, 234, 61,
297, 567, 1957, 320, 214,
232, 1216, 925, 186, 325,
60, 308, 70, 760, 214,
1341, 1186, 137, 1597, 503
```
---
🔍 Explanation:
- For
addition, align the numbers vertically and add digit by digit from right to left, carrying over when needed.
- For
subtraction, subtract digit by digit, borrowing if necessary.
- Always double-check for regrouping (carrying/borrowing) in multi-digit operations.
For example:
-
978 + 979:
8 + 9 = 17 → write 7, carry 1
7 + 7 + 1 = 15 → write 5, carry 1
9 + 9 + 1 = 19 → write 19
Result:
1957
-
974 - 914:
4 - 4 = 0
7 - 1 = 6
9 - 9 = 0
Result:
60
---
✔ All calculations have been verified.
Let me know if you'd like a printable version or a worksheet with answers!
Parent Tip: Review the logic above to help your child master the concept of add and subtract within 1000 worksheet.
