What you need to know
Things to remember:
- The “thousands” go on the left of the decimal.
- The “hundreds” go on the right of the decimal.
- If there are only thousands, there will be no decimal!
We will use converting from kilometres to metres to help us see how we can convert from metres to kilometres.
“Convert 5.9km to m”
Let’s split this into the whole number and the decimal
5km = 5000m
0.9km = 900m
5.9km =5km+ 0.9km = 5000m + 900m = 5900m
If we flip this around to start with km, then we will notice something nice.
5900m =5000m + 900m = 5km + 0.9km = 5.9km
We can see that the thousands become a “whole number” of kilometres, and the hundreds become the decimal part.
7600m =7000m + 600m = 7km+0.6km = 7.6km
1300m =1000m + 300m = 1km+0.3km 1.3km
If we only have thousands, then there won’t be a decimal!
1000m = 1km
5000m = 5km
9000m = 9km
Question 1: Convert 3000m into kilometres.
3000m = 3km
Question 2: Convert 9800m into km.
9800m =9000m + 800m = 9km+0.8km = 9.8km