11-Plus Maths Quiz - Addition and Subtraction (Medium) (Questions)

In this medium level quiz on addition and subtraction, 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:

Rather than use a pencil and paper for this quiz, try to work the answers out in your head. The more you use your brain in order to work things out, the easier your shopping trips will be.

See if you can beat your classmates in this 11-plus Maths quiz. If you don't get full marks, try again.

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
11-Plus Maths Quiz - Addition and Subtraction (Medium) (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