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Doctors Medicines MCQs Q&A

Round off each of the following to the number of significant digits indicated :

i. 1.223 to two digits 

ii. 12.56 to three digits 

iii. 122.17 to four digits 

iv. 231.5 to three digits

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1 Answers

i. 1.223 to two digits = 1.2 

This is because the third digit is less than 5, so we drop it and all the other digits to its right. 

ii. 12.56 to three digits = 12.6 

This is because the fourth digit is greater than 5, so we drop it and add 1 to the third digit. 

iii. 122.17 to four digits = 122.2 

This is because the fifth digit is greater than 5, so we drop it and add 1 to the fourth digit. 

iv. 231.5 to three digits = 232 

This is because the fourth digit is 5, so we drop it and add 1 to the third digit.

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