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# Estimation in Arithmetical Calculations (F)

As we delve into the art of estimation in mathematical calculations, we're adding an intriguing dimension to our revision session with a captivating video comparison. Join us as we explore the differences between the mass and volume of both mercury and water.

When performing calculations, it’s always good to carry out a common-sense check and have a rough idea of the answer. This is true even if you are working with a calculator, as it is easy to mis-type an entry! Put your estimating and approximation skills to the test in this GCSE Maths quiz.

Approximating is all about making the calculation easier, by rounding each number to 1 significant figure. Very often, you will then be able to do it in your head. Things can get a little bit trickier when division is involved – ideally, you want both the numerator and denominator to have a common factor, so that one is a multiple of the other and it will cancel down.

Working out an approximate answer will give you an indication of the size of the answer (this is often called the ‘ball park figure’).

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