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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!
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
894 - 183 - 500 + 17 = (800 - 500 - 100) + (90 + 10 - 80 - 0) + (4 + 7 - 3 - 0) = 200 + 20 + 8 = 228
53 - 467 + 643 = (53 + 643) - 467 = 696 - 467 = 229
353 - 28 + 11 + 27 = (300) + (50 + 10 + 20 - 20) + (3 + 1 + 7 - 8) = 300 + 60 + 3 = 363
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
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926 + 220 - 403 = (900 + 200 - 400) + (20 + 20 - 0) + (6 + 0 - 3) = (700) + (40) + (3) = 743
You can ignore the zeros