A stick has a length of `12.132cm` and another stick has a length of `12.4cm`.
If the two sticks are placed end to end, what is their total length?
If the two sticks are placed side by side , what is the difference in their lengths?

Explanation

Let lengths of the sticks are named as `l_(1)=12.132cm, l_(2)=12.4cm`
Here `l_(2)`has one decimal place and `l_(1)`has to be rounded off t o have only two decimal places
`l_(1)+l_(2)=12.13+12.4=24.53`.
This is to be rounded off to have one decimal place only.
`:.` The total length is` 24.5cm`
`l_(1)=12.132, l_(2)=12.4`. ` l_(1)-l_(2)=12.4-12.132`
Here `12.4`has only decimal place and hence `12.132`should have only two decimal places.
`:.l_(1)-l_(2)=12.4-12.13=0.27`
this should be rounded off to have only one decimal place .
`:.l_(1)-l_(2)=0.3`
Hence difference of their lengths is `0.3`cm