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

a) Let lengths of the rods are named as
`l_(1)=12.132 cm rArr l_(2)=12.4 cm`
Here `l_(2)` has one decimal place and `l_(1)` has to be rounded to have only two decimal places.
`l=l_(1)+l_(2)=12.13+12.4=24.53`
This is to be rounded off to have one decimal place only.
`therefore` The result is 24.5 cm
b) `l_(1)=12.132 cm, l_(2)=12.4 cm`
Here `l_(1)` is rounded only two decimal places, `l_(2)-l_(1)=12.4-12.13=0.27`
This should be rounded off to have only one decimal place, `l_(2)-l_(1)=0.3`