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You would tend to use whatever units make the calculation and the answer easiest to perform and read.

Here it is likely that you would convert the dimensions into metres as this keeps the units small and as one side is exactly 1 metre it makes the calculation simple.

You could convert into any unit you like, but keeping the measurements in metres here means that you are not dealing with large (or long) numbers with lots of zeros in them. You are making each number as simple as you can.

So here the area is equal to 1 * 0.34 = 0.34m2

As a counter example let us imagine if we used cm. Then the calculation would be 100 * 34 = 3,400 cm2. This would be a perfectly acceptable answer but the first would more often be chosen because the answer requires less digits. If you used mm for example then the answer would become even bigger still. We want to keep our answers short and easy to read and understand, so we pick a unit that will do that.

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Q: What units would you use to measure the area of a rectangle with l 1 m and w 34 cm explain?
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