it is 5 and above, add one unit to the last highlighted digit. Carry to the left if
Step 1: Identify the first non-zero digit from the left.
Step 2: From this digit, start highlighting n significant figures.
Step 3: Look at the digit just after the last highlighted digit. Round up if
this is 5 and above, otherwise do nothing.
Always remember to include the place-holder ‘0’s.