Succeed with maths – Part 2

# 4 Less familiar units

You’ve nearly reached the end of this week but there is one final activity to check your newly honed skills with converting between units. This involves some units that you may not be familiar with. However, all the techniques that you have been building over the last two weeks are still relevant, so bear these in mind as you work your way through Activity 8. Don’t forget to click on ‘reveal comment’ for an additional hint.

## Activity 8 Converting between less familiar units

Allow approximately 5 minutes

1. Given the fact that:

   Now convert 322 kWh to J.

## Discussion

Remember to consider whether the final answer should be bigger or smaller than the original value given. This will tell you whether to multiply or divide by the conversion factor.

## Answer

This means that for every 1 kWh there are 3 600 000 J. That is a lot of joules for each kilowatt-hour! So the final answer will be much larger than the original value. That means multiplying to convert between the two.

2. Given that 1 chain = 66 feet, convert 4345 feet to chains.

## Answer

2. This time the final answer will be smaller than the original value, so you need to divide.

3. Given that:

   convert 3.5 carats to mg.

## Answer

3. The final answer needs to be larger than the original value. This means you must multiply.

OpenLearn - Succeed with maths – Part 2
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