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They key to answering this question is that it is only asking for an estimate. So you don't need to provide an exact answer; as long as your answer is within a certain range you will get full marks provided ...

The most common way of doing this is called a bubble search (this may not be the technical name, but it's the one I was taught). The method is as follows: Start by writing the number at the top of your page....

Start by multiplying the two numbers as though they didn't have a decimal point (e.g. 2.7 3.6 becomes 27 36 = 972). Now add up how many decimal places were in the original two numbers (e.g. 2.7 and 3.6 have ...

In order to simplify a surd you need to look at the factors of the number under the square root. You can then multiply together the square roots of the factors. For example if you wanted to simplify sqrt(12)...

Firstly, what is the product rule? What does it actually say? Well, it tells us how to differentiate a function of the form uv - the product of the functions u and v. If y = uv, the product rule says: dy/dx ...