To round off a number to three significant figures, look at the digit immediately to the right of the third significant figure. If it is 5 or greater, round up the last significant figure. If it is less than 5, leave the last significant figure unchanged.
To round off a number to three significant figures, we look at the digit immediately to the right of the third significant figure. If it is 5 or greater, we round up the last significant figure. If it is less than 5, we leave the last significant figure unchanged. In the case of 1.235, the third significant figure is 5, so we round up the last significant figure:
1 .235 → 1 .24
The appropriate question is:
Round off the following term into three significant figures:
a) 1.235