A stick has a length of l12.132 cm and another stick has a length of 12.4 cm.
(a) If the two sticks are placed end to end, what is their total length ?
(b) If the two sticks are placed side by side, what is the difference in their lengths ?

Explanation

(a) Let lengths of the sticks arce named as `I_(1)= 12.132cm. I_(2) = 124 cm `
Here `I_(2)` has one decimal place and `I_(1)` has to be rounded off to have only two decimal places
`I_(1)+I_(2)=12.13+12.4=24.53`
This is to be rounded off to have one decimal place only.
This is to be rounded off to have one decimal place only. The total length is 24.5cm
(b) `I_(1)=12.132 , I_(2) = 12.4 . I_(1) -I_(2)=12.4 -12.132`
Here 12.4 has only decimal place and hence 12.132 should have only two decimal places.
`:. I_(1)-I_(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