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

Explanation

`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.
`therefore l_1 - l_2 = 12.4 - 12.13 = 0.27 `
This should be rouned off to have only one decimal place.
`therefore l_1 - l_3 = 0.3`
Hence difference of their lengths is 0.3 cm.