# Blog

## Do you trust your calculator too much?

By David Shaw, 7 November 2019

Imagine you’re at university, doing a maths quiz, with a calculator provided. The problem you’re tasked with reads, “Your grandmother was born in 1942, how old was she in 1994?” You think for a moment and realise it’s a subtraction problem. Into your calculator, you type “1994 – 1942”, and then triumphantly, you record the […]

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## Broken calculator

By David Shaw, 8 August 2018

Imagine your calculator is broken. Although it will still display numbers, only the 4 key, + key, = key and clear key work. Starting at 0, can you get the calculator to display 1000? What’s the fastest way, with the fewest button presses?

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## Counting by division

By David Shaw, 5 December 2016

Let’s look at a few interesting patterns you can get by dividing. Some of these patterns need a lot of digits, so get the best calculator you can find.

## Magic calculator

By David Shaw, 27 March 2016

Are you a magician? Or a mathematician! Guess someone’s number with this cool trick.

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