# Video: AQA GCSE Mathematics Foundation Tier Pack 2 • Paper 2 • Question 3

How many millimetres are there in 3.3 m? Circle your answer. [A] 0.0033 [B] 3003 [C] 3300 [D] 330

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### Video Transcript

How many millimetres are there in 3.3 metres? Circle your answer. The possible answers are 0.0033, 3003, 3300, and 330.

So first of all, we need to remember one of our conversion factors. And that is that one metre is equal to 1000 millimetres. We could also find this from a couple of other conversion factors. And that is that one metre is equal to 100 centimeters. And one centimetre equals 10 millimetres. So therefore, if we multiplied 10 by 100, we’d get 1000. So therefore, we could say that one metre will be equal to 1000 millimetres.

So how does this help us. Well, we can see that if we want to convert from metres to millimetres, we’ll multiply by 1000 because one multiplied by 1000 is 1000. And if we wanted to convert from millimetres to metres, we’d divide by 1000 because 1000 divided by 1000 is one.

So therefore, to convert our 3.3 metres into millimetres, we’re gonna multiply 3.3 by 1000, which is 3300. And we can do this on the calculator. And to just remind us what it means when you multiplied by 1000. It means that each digit is gonna be moved three place values to the left. So therefore, 3.3, we have three units and three tenths. Well, three units becomes three thousands. And the three tenths becomes three hundreds. And then we add two zeros.

So therefore, we can say that there are 3300 millimetres in 3.3 metres.