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Numbers everywhere! In this quiz we look at 3-figure ones.

Addition and Subtraction 3 (Medium)

So, you have made it to the third quiz in our Medium section of Eleven Plus maths quizzes on Addition and Subtraction. If you have already played all our previous quizzes on the topic, then well done you! If you haven’t then you may wish to go back and play them before you tackle this quiz.

Solving addition and subtraction problems is one of the easiest parts of maths. But what if the questions involve 3-figure numbers in the hundreds? You will be pleased to hear that they are no different to any other addition or subtraction problems – they just have an extra column.

TIP: With 3-figure numbers, add the hundreds first, then the tens and then the ones.

Sometimes you will spot some shortcuts which mean you don’t have to do the calculations the long way round. You’ll find more tips in the helpful comments to this quiz. So, if you are ready, let’s play!

1 .

926 + 220 - 403 = ?

743

703

783

683

With numbers less than 1,000, add the hundreds first, then the tens and then the ones.
926 + 220 - 403 = (900 + 200 - 400) + (20 + 20 - 0) + (6 + 0 - 3) = (700) + (40) + (3) = 743
You can ignore the zeros

2 .

690 + 426 - 888 = ?

218

228

238

248

A quick way to add 690 is to add 700 then subtract 10.
Here’s the other way to solve the problem, by adding the hundreds first, then the tens and then the ones:
690 + 426 - 888 = (600 + 400 - 800) + (90 + 20 - 80) + (0 + 6 - 8) = 200 + 30 + -2 = 228

3 .

600 + 300 + 400 - 678 = ?

626

624

622

620

600 + 400 = 1,000. Keep your eyes peeled, looking for ways to break the problem up into smaller sums

4 .

894 - 183 - 500 + 17 = ?

208

216

211

228

Remember, 100s first, then 10s, then ones:
894 - 183 - 500 + 17 = (800 - 500 - 100) + (90 + 10 - 80 - 0) + (4 + 7 - 3 - 0) = 200 + 20 + 8 = 228

5 .

53 - 467 + 643 = ?

229

228

227

226

To avoid working with negative numbers, you can rearrange the problem:
53 - 467 + 643 = (53 + 643) - 467 = 696 - 467 = 229

6 .

620 + 123 - 83 = ?

663

660

657

654

In multiple choice questions, the last digit in the answers can help you find the correct answer more quickly. 0 + 3 - 3 = 0 so you know the correct answer will end with a zero. Be on the LOOKOUT FOR SHORT CUTS like this

7 .

420 - 403 - 100 + 349 = ?

246

256

266

276

Always look out for shortcuts: the 400s in 420 – 403 cancel each other out, making the answer the same as 20 - 3

8 .

751 + 226 - 805 = ?

162

177

172

Remember: in multiple choice quizzes, the last digit in a number can show you the right answer. 1 + 6 - 5 = 2, so the last digit in the correct answer will also be a 2

9 .

353 - 28 + 11 + 27 = ?

362

363

364

365

It's a good idea to add the hundreds first, then the tens and finally the ones:
353 - 28 + 11 + 27 = (300) + (50 + 10 + 20 - 20) + (3 + 1 + 7 - 8) = 300 + 60 + 3 = 363

10 .

909 + 76 - 654 - 13 = ?

318

320

322

324

TIP: With numbers less than 1,000, add the hundreds first, then the tens and then the ones.
909 + 76 - 654 - 13 = (900 - 600) + (0 + 70 - 50 - 10) + (9 + 6 - 4 - 3) = 300 + 10 + 8 = 318
You can repeat the procedure if you are having difficulty in doing it in your head

Author: Frank Evans (Specialist 11 Plus Teacher and Tutor)