Round off each of the following to the number of significant digits in

1.	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
Answer» 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.

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

Answer»

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.