Math: Elementary School: Grades 3, 4 and 5 Quiz - Addition and Subtraction 7 (Questions)

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In this quiz you are going to get some practice in adding and subtracting hundreds.TIP: With numbers less than 1,000, add the hundreds first, then the tens and then the units. For example:

In each of the following questions, what is the answer to the given problem?
1. 123 + 56 + 684 - 3 = ?
[ ] 870
[ ] 880
[ ] 860
[ ] 890
2. 345 + 450 - 200 = ?
[ ] 597
[ ] 598
[ ] 596
[ ] 595
3. 245 + 309 - 68 = ?
[ ] 486
[ ] 485
[ ] 487
[ ] 488
4. 234 - 450 + 389 = ?
[ ] 170
[ ] 174
[ ] 175
[ ] 173
5. 500 + 200 + 400 - 678 = ?
[ ] 420
[ ] 421
[ ] 422
[ ] 423
6. 238 - 78 - 45 + 167 = ?
[ ] 228
[ ] 282
[ ] 283
[ ] 284
7. 400 - 389 - 400 + 567 = ?
[ ] 177
[ ] 178
[ ] 180
[ ] 176
8. 789 + 567 - 968 = ?
[ ] 388
[ ] 389
[ ] 390
[ ] 387
9. 234 - 68 + 2 + 13 = ?
[ ] 180
[ ] 182
[ ] 181
[ ] 183
10. 400 + 323 - 23 = ?
[ ] 703
[ ] 697
[ ] 700
[ ] 723
Math: Elementary School: Grades 3, 4 and 5 Quiz - Addition and Subtraction 7 (Answers)
1. 123 + 56 + 684 - 3 = ?
[ ] 870
[ ] 880
[x] 860
[ ] 890
TIP: With numbers less than 1,000, add the hundreds first, then the tens and then the units. 123 + 56 + 684 - 3 = (100 + 600) + (20 + 50 + 80) + (3 + 6 + 4 - 3) = 700 + 150 + 10 = 860. You can repeat the procedure if you are having difficulty in doing it in your head
2. 345 + 450 - 200 = ?
[ ] 597
[ ] 598
[ ] 596
[x] 595
345 + 450 - 200 = (300 + 400 - 200) + (40 + 50) + (5) = 500 + 90 + 5 = 595
3. 245 + 309 - 68 = ?
[x] 486
[ ] 485
[ ] 487
[ ] 488
245 + 309 - 68 = (200 + 300) + (40 - 60) + (5 + 9 - 8) = 500 - 20 + 6 = 486
4. 234 - 450 + 389 = ?
[ ] 170
[ ] 174
[ ] 175
[x] 173
234 - 450 + 389 = (200 - 400 + 300) + (30 - 50 + 80) + (4 + 9) = 100 + 60 + 13 = 173
5. 500 + 200 + 400 - 678 = ?
[ ] 420
[ ] 421
[x] 422
[ ] 423
500 + 200 + 400 - 678 = (500 + 200 + 400 - 600) - (70) - (8) = 500 - 78 = 422. You can repeat the procedure if you are having difficulty in doing it in your head. Note: with negative numbers, the negative sign is kept with each part of the number, e.g. - 678 is written as -600, -70, -8
6. 238 - 78 - 45 + 167 = ?
[ ] 228
[x] 282
[ ] 283
[ ] 284
238 - 78 - 45 + 167 = (200 + 100) + (30 - 70 - 40 + 60) + (8 - 8 - 5 + 7) = 300 - 20 + 2 = 282
7. 400 - 389 - 400 + 567 = ?
[ ] 177
[x] 178
[ ] 180
[ ] 176
400 - 389 - 400 + 567 = (500 - 300) + (60 - 80) + (7 - 9) = 200 - 20 - 2 = 178
8. 789 + 567 - 968 = ?
[x] 388
[ ] 389
[ ] 390
[ ] 387
789 + 567 - 968 = (700 + 500 - 900) + (80 + 60 - 60) + (9 + 7 - 8) = 300 + 80 + 8 = 388
9. 234 - 68 + 2 + 13 = ?
[ ] 180
[ ] 182
[x] 181
[ ] 183
234 - 68 + 2 + 13 = (200) + (30 - 60 + 10) + (4 + 2 + 3 - 8) = 200 - 20 + 1 = 181
10. 400 + 323 - 23 = ?
[ ] 703
[ ] 697
[x] 700
[ ] 723
400 + 323 - 23 = (400 + 300) + (20 - 20) + (3 - 3) = 700. Be on the LOOKOUT FOR SHORT CUTS: 323 - 23 = 300