A 100 kilometres per hour signpost.
In this quiz we'll be adding and subtracting numbers over 100.

Addition and Subtraction 2 (Medium)

This is the second of our medium level quizzes on addition and subtraction. Like the previous quiz, it will give you a chance to practice adding and subtracting hundreds. Don’t worry – it’s not much more difficult than working with numbers less than 100 – especially if you add the hundreds first, then the tens and finally the units.

You might be tempted to get your calculator out for this quiz – don’t! Trying to find the answers using nothing but your brain will set you in good stead for future encounters with maths. If you can do simple mathematics like this in your head, then more advanced problems will be just that little bit easier.

So, if you are ready, heads down, pencils and pens put away and calculators confined to a drawer! Let’s begin.

1.
214 + 67 + 734 - 19 = ?
995
996
997
998
Remember to add the 100s, then 10s and finally units. If yiou aren't sure of your answer, you can do the procedure again to double check
2.
897 + 328 - 478 = ?
747
748
749
750
897 + 328 - 478 = (800 + 300 - 400) + (90 + 20 - 70) + (7 + 8 - 8) = (700) + (40) + (7) = 747
3.
546 + 395 – 142 = ?
801
800
799
798
In multiple choice quizzes, the last digit in a number can show you the right answer. 6 + 5 - 2 = 9, so the last digit in 546 + 395 – 142 will also be a 9
4.
147 + 476 – 38 = ?
582
583
584
585
7 + 6 - 8 = 5, so you know that the answer to 147 + 476 – 38 will also end with a 5
5.
364 – 88 + 5 + 17 = ?
294
296
298
300
It's a good idea to add the hundreds first, then the tens and finally the units: 364 – 88 + 5 + 17 = (300) + (60 + 10 - 80) + (4 + 5 + 7 - 8) = (300) + (70 - 80) + (16 - 8) = 300 - 10 + 8 = 298
6.
376 - 597 + 233 = ?
6
12
18
24
To avoid working with negative numbers, you can rearrange the problem: 376 - 597 + 233 = (376 + 233) - 597 = 609 - 597 = 12
7.
700 + 100 + 300 – 786 = ?
214
264
314
324
700 + 300 = 1,000. keep your eyes peeled, looking for ways to break the problem up into smaller sums
8.
354 – 75 – 83 + 248 = ?
434
444
454
464
Remember, 100s first, then 10s, then units: 354 – 75 – 83 + 248 = (300 + 200) + (50 + 40 - 70 - 80) + (4 + 8 - 5 - 3) = (500) + (-60) + (4) = 444
9.
720 – 703 – 300 + 821 = ?
538
539
540
541
Always look out for shortcuts: the 700s in 720 – 703 cancel each other out, making the answer the same as 20 - 3
10.
608 + 753 - 487 = ?
871
872
873
874
With numbers less than 1,000, add the hundreds first, then the tens and then the units. 608 + 753 - 487 = (600 + 700 - 400) + (50 - 80) + (8 + 3 - 7) = (900) + (-30) + (4) = 874
Author:  Frank Evans

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