# What is the difference of 13.9 - 13.70?

Sep 1, 2016

Another way of thinking about it. Same thing but in disguise!

$0.2$

#### Explanation:

We know that 9 can be split (partitioned) into 7+2 so 0.9 = 0.7+0.2
We also know that 13.70 + 0 = 13.70

So write $13.9 \text{ as } 13.7 + 0.2$

Putting it all together we have

$13.7 + 0.2$
$\underline{13.7 + 0.0} - \leftarrow \text{ Subtract}$
$\text{ } 0 + 0.2$

$\textcolor{red}{\text{Once you more used used to subtraction it becomes a bit easier}}$

Sep 2, 2016

They differ by $0.2$

#### Explanation:

In Maths, the word "DIFFERENCE" implies a subtraction.

It is asking by how much the numbers differ.
We usually take the small one away from the bigger one, which is written on top:
Line up the decimal points under each other and subtract from the right towards the left.

$\textcolor{w h i t e}{\times \times l} 13.90$
$\textcolor{w h i t e}{\times x l} \underline{- 13.70}$
$\textcolor{w h i t e}{\times \times l} \underline{00.20} = 0.2$