Practise easy addition and subtraction with this 11 Plus Maths quiz. Learn how numbers connect and discover tricks that make sums faster and more fun to solve.
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TIP: With numbers less than 100, add the tens first and then add the units. 31 + 7 - 14 = (30 - 10) + (1 + 7 - 4) = 20 + 4 = 24
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You might have done this one in your head.
27 - 18 = (20 - 10) + (7 - 8) = 10 - 1 = 9 If you are adding -1 then you are simply subtracting 1 |
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16 + 16 + 16 = (10 + 10 + 10) + (6 + 6 + 6) = 30 + 18 = 48. Obviously, if you know that 16 × 3 = 48 (not many of us know our 16 times table), you won't follow this procedure. Always BE ON THE LOOKOUT for short cuts
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19 + 15 - 19 + 3 = (15 + 3) = 18
Cross out identical pairs of numbers that differ only in sign, e.g. +19 -19 = 0. Don't waste your time adding them to your final calculations |
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54 + 19 + 3 - 14 = (50 + 10 - 10) + (4 + 9 + 3 - 4) = 50 + 12 = 62
A quick way to add 19 is to add 20 then subtract 1 |
37 - 22 + 13 = (30 + 10 - 20) + (7 + 3 - 2) = 20 + 8 = 28
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36 + 0 + 17 - 0 - 6 = (30 + 10) + (7) = 40 + 7.
Remember, zeros are worth nothing in addition and subtraction! You can also ignore the sixes because one is to be added and the other taken away |
23 + 18 - 14 + 6 = (20 + 10 - 10) + (3 + 8 + 6 - 4) = 20 + 13 = 33
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6 + 3 + 4 + 8 + 7 + 7 + 2 = (6 + 4) + (7 + 3) + (8 + 2) + 7 = 37. Try to group your numbers in lots of ten
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56 + 17 - 12 + 3 - 5 = (50 + 10 - 10) + (6 + 7 + 3 - 2 - 5) = 50 + 9 = 59
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