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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 end to end , what is their total length ? |
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Answer» Solution :(a) 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 to 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 `therefore` The TOTAL length is 24.5cm (b) `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 shoudl 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_(2)= 0.3` Hence DIFFERENCE of their lengths is 0.3cm |
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