Step by step
The question
Question: find the range of 2.4, 6.1, 3.8 and 0.9.
Range of 2.4, 6.1, 3.8, 0.9
The range shows how spread out the numbers are: the biggest minus the smallest.
range = biggest − smallest
1 Put them in order
First we put them in order, smallest first: 0.9, 2.4, 3.8 and 6.1.
= 0.9, 2.4, 3.8, 6.1
We still have 4 numbers.
None is lost.
4 numbers ✓
2 Smallest and biggest
In order, the smallest is first and the biggest is last.
The smallest is 0.9.
The biggest is 6.1.
= smallest = 0.9, biggest = 6.1
3 Take away
The range is the biggest minus the smallest.
= range = 6.1 − 0.9
6.1 minus 0.9 is 5.2.
= range = 5.2
Let's look back.
First: put them in order.
Then: smallest and biggest.
Last: take away.
Answer
= range = 5.2