Length, width, height and depth are the four linear measurements we have explored throughout this module. In Australia, the metric system of measurement is used, with millimetres (mm) and metres (m) being the most common. However, there is an easy trick to try and remember when it comes to converting metric measurements. When you are going from a larger unit of measure to a smaller one, count the number of zeros and move the decimal that many places to the right.
The measuring tools we’ve explored in this module are retractable tape measures, wind-up tape measures, folding or steel rulers and laser distance measures. Depending on the measuring task, one might be more suitable to use than the other. Measuring tapes are typically used for measuring distances less than 10m and wind-up tapes more than 10m. Folding or steel rulers are used to measuring and marking straight lines. Laser distance measures can be used as an alternative to measuring tapes.
We have explored several common calculations you can expect to use, including:
- Perimeter: The perimeter is the total distance around the outside edge of a shape.
- Circumference: The circumference is the total distance around the outside edge of a circle.
- Area: Area is the size of a surface.
- Volume: Volume is the amount of space within an object.
- Ratios: Ratios are the comparison of amounts. For example, the ratio of water to cement when mixing concrete is often 1:4. So, if you add 1 kg of water to the mix, you would add 4 kg of cement.
- Weight: To calculate weight, you will need to know the average weight of the material per cubic metre (or cubic mm).
- Percentage: A percentage is a way of expressing a fraction or a part of 100. So 10 per cent is 10 parts out of 100 parts (remember ratios).
