Tag Archives: mental arithmetic

Subtraction by Adding On

This is also sometimes called “subtraction using a blank numberline” and I’ve even heard it called “that nonsensical modern method”. This latter is a real misnomer since it is neither nonsensical nor modern. In fact it’s a method that dates … Continue reading

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How I passed the QTS maths test – part 1

Like a lot of people, I was always scared of maths. I hated it at school – somehow those numbers never made as much sense to me as they did to my peers. But because claiming to be bad at … Continue reading

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Finding a square of a 2-digit number in your head

Recently we looked at how to square two-digit numbers ending in 5 in your head.  What about the other square numbers?  Well, there’s a quick way to do that in your head as well. Let’s look at 372. First of … Continue reading

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How to square 2 digit numbers ending in 5 (in your head)

This is another trick that my family already knew, but I only learnt it recently so I’m sharing it for anybody out there who doesn’t already know. Squaring 2 digit numbers is easy if they end in 5. 5×5 = … Continue reading

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Multiplying 2 digit numbers by 11

Earlier this year I discovered a trick for multiplying 2 digit numbers by 11.  I taught this to some of the children I tutor to help them work out 11×11 and 11×12 which they had been struggling with but then … Continue reading

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D is also for… Division

Sometimes in maths it’s really useful to be able to look at a number and tell quickly what numbers it is possible to divide it by. There are a few tricks you can use to tell whether one number is … Continue reading

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Teaching the Times Tables

I’ve been tutoring maths for a number of years now. I’ve tutored boys and girls. I’ve tutored individuals and small groups. I’ve tutored children of all ages from very different social backgrounds. But they have all had one thing in … Continue reading

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