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The Mental Arithmetic Challenge

Solve this sum as quickly as you can! If you get stuck the just click Another Sum to move on. If you want to check if your answer is right once you have worked it out, just click 'Show Answer'.

Remember, the aim is to see an improvement over time, so try doing around ten sums at a time and record how quickly you do them and how many you get right.

Then keep on coming back daily and doing the same, and soon you will see how much better you are getting at doing the mental arithmetic required due to your brain getting quicker at maths with the practice, and you will have cracked the mental arithmetic challenge!

902 - 138 = ?

Show Answer

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