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Addition and Subtraction (Medium)
How good are you at adding and subtracting hundreds?

Addition and Subtraction (Medium)

In this third 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:

  • 120 + 360 + 22 + 8 = (100 + 300) + (20 + 60 + 20) + (2 + 8) = 400 + 100 + 10 = 510

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.
400 + 323 - 23 = ?
703
697
700
723
400 + 323 - 23 = (400 + 300) + (20 - 20) + (3 - 3) = 700. Be on the LOOKOUT FOR SHORT CUTS: 323 - 23 = 300
2.
345 + 450 - 200 = ?
597
598
596
595
345 + 450 - 200 = (300 + 400 - 200) + (40 + 50) + (5) = 500 + 90 + 5 = 595
3.
234 - 68 + 2 + 13 = ?
180
182
181
183
234 - 68 + 2 + 13 = (200) + (30 - 60 + 10) + (4 + 2 + 3 - 8) = 200 - 20 + 1 = 181
4.
245 + 309 - 68 = ?
486
485
487
488
245 + 309 - 68 = (200 + 300) + (40 - 60) + (5 + 9 - 8) = 500 - 20 + 6 = 486
5.
123 + 56 + 684 - 3 = ?
870
880
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
6.
234 - 450 + 389 = ?
170
174
175
173
234 - 450 + 389 = (200 - 400 + 300) + (30 - 50 + 80) + (4 + 9) = 100 + 60 + 13 = 173
7.
400 - 389 - 400 + 567 = ?
177
178
180
176
400 - 389 - 400 + 567 = (500 - 300) + (60 - 80) + (7 - 9) = 200 - 20 - 2 = 178
8.
238 - 78 - 45 + 167 = ?
228
282
283
284
238 - 78 - 45 + 167 = (200 + 100) + (30 - 70 - 40 + 60) + (8 - 8 - 5 + 7) = 300 - 20 + 2 = 282
9.
500 + 200 + 400 - 678 = ?
420
421
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
10.
789 + 567 - 968 = ?
388
389
390
387
789 + 567 - 968 = (700 + 500 - 900) + (80 + 60 - 60) + (9 + 7 - 8) = 300 + 80 + 8 = 388
Author:  Frank Evans

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