Unit 2: ADDING AND SUBTRACTING NUMBERS 1–1,000 || Singapore Math
Examples:
1. 316
+ 121
———-
437
2. 625
– 313
———
312
3. 1 1
483
+398
———
881
4.
6 9 10
7 0 0
-2 9 3
————
4 0 7
Solve the addition problems below.
1. 143
+ 214
———–
2. 312
+ 481
———–
3. 732
+ 145
———–
4. 201
+ 283
———–
5. 821
+ 163
———–
Solution:
1. 143
+ 214
357
2. 312
+ 481
793
3. 732
+ 145
877
4. 201
+ 283
484
5. 821
+ 163
984
Solve the subtraction problems below.
6. 569
– 234
7. 932
– 121
8. 736
– 204
9. 375
– 152
10. 859
– 607
Solution:
6. 569
– 234
335
7. 932
– 121
811
8. 736
– 204
532
9. 375
– 152
223
10. 859
– 607
252
Solve the following addition problems by regrouping.
11. 135
+109
12. 505
+295
13. 737
+129
14. 256
+380
15. 462
+208
16. 397
+546
Solution:
11. 135
+109
244
12. 505
+295
800
13. 737
+129
866
14. 256
+380
636
15. 462
+208
670
16. 397
+546
943
Solve the following subtraction problems by regrouping.
17. 353
– 174
18. 971
-369
19. 400
– 205
20. 632
– 171
21. 412
– 124
22. 500
– 178
23. 800
– 280
24. 980
– 555
Solution:
17. 353
– 174
179
18. 971
-369
602
19. 400
– 205
195
20. 632
– 171
461
21. 412
– 124
288
22. 500
– 178
322
23. 800
– 280
520
24. 980
– 555
425
25. Match each balloon to the correct tag.
Solution:
Fill in each empty box with a +, – or = sign.
26.
| 73 | 42 | 115 | ||
| 70 | 30 | 40 | ||
| 3 | 72 | 75 |
Solution:
| 73 | + | 42 | = | 115 |
| – | + | – | ||
| 70 | – | 30 | = | 40 |
| = | = | = | ||
| 3 | + | 72 | = | 75 |
27.
| 231 | 124 | 355 | ||
| 115 | 96 | 19 | ||
| 116 | 220 | 336 |
Solution-27:
| 231 | + | 124 | = | 355 |
| + | – | |||
| 115 | – | 96 | = | 19 |
| – | = | = | ||
| 116 | + | 220 | = | 336 |
Solve the following story problems. Show your work in the space below.
28. Lena collects 389 stickers. Anne collects 317 more stickers than Lena. How many stickers does Anne collect?
Anne collects ________ stickers.
Solution-28:
Lena collects 389 stickers;
∴ Anne collects = 389+317 = 706;
Answer: Anne collects 706 stickers.
29. Tom has 416 bottle caps. John has 29 bottle caps fewer than Tom. How many bottle caps does John have?
John has ______ bottle caps.
Solution-29:
Tom has 416 bottle caps;
∴ John has = 416 – 29 = 387;
Answer: John has 387 bottle caps.
30. Mr. Abdul sold 586 roses on Monday. He sold 237 roses on Tuesday. How many roses did he sell altogether?
He sold ______ roses altogether.
Solution:
Mr. Abdul sold on Monday = 586
Mr. Abdul sold on Sunday = 237
∴ He sold roses altogether = 586 + 237 = 823
Answer : He sold 823 roses altogether.
31. There were 416 (four-hundred-sixteen) visitors to a museum on Saturday. There were 555 (five-hundred-fifty-five) visitors to the museum on Sunday. How many visitors were at the museum on both days (Saturday & Sunday)?
________ visitors were at the museum on both days (Saturday & Sunday).
Solution:
Visitors were at the museum on Saturday = 416
Visitors were at the museum on Sunday = 555
∴ Visitors were at the museum on both days (Saturday & Sunday) = 416 + 555 = 971
Answer: 971 visitors were at the museum on both days (Saturday & Sunday).
32. Marcus and Jack spent $837 at a computer fair. If Jack spent $469, how much did Marcus spend?
Marcus spent $________
Solution:
Marcus and spent Marcus = $837
Jack spent = $469
∴ Marcus spent = $837 – $469 = $368
Answer: Marcus spent $368.
