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When ordering numbers, it is a good idea to compare the digits in their place
values, especially when the numbers look very similar.
We compare the largest place value first, then slowly move down until we find
a difference. There are also some mathematical signs we can use to show the
information we have found out.
This means ‘less than’ so for example, 6 < 7
This means ‘more than’ so for example, 10 > 5
Think of the signs as the snapping jaws of crocodiles.
The jaws of the crocodile should always be facing the bigger number.
Remember, crocodiles are greedy so that’s the number they’ll eat.
We can also use ordering to compare decimals in the same way
and we can also use ordering to list numbers from largest to
smallest or smallest to largest.
Let’s try a slightly harder example this time, using a few numbers instead of two.
We’re also going to use decimals.
We’ve collected the weights of four bags of sugar and we want to order the
smallest to the largest.
The weights are:
3.23kg 3.32kg 3.37kg 3.19kg
3.32 3.37 3.19 3
3 3 3 0.2
0.3 0.3 0.1
Here we can see that there’s a difference between some of the numbers.
The 0.1 is smallest, then 0.2 but we don’t know the difference between he
two 0.3 so we have to carry on with only them.
0.02 0.07 0.07 is larger than 0.02 so we now have all the information we
need to order the four numbers: 3.19kg , 3.23kg , 3.32kg , 3.37kg