How do you reduce a number to a certain number of significant digits?

1 Answer
May 20, 2017

Follow a step by step process.


Step 1. Underline the number of significant figures you need
Example. If you need to reduce #5572# to 2 significant figures, underline the two numbers on the left: #ul5 ul5 72#

Step 2. Look at the next number (not underlined)
Example. #ul5 ul5 color(red)(7) 2#

Step 3. Round up or down depending on the following rule
- If the next number is 5 or more, round up
- If the next number is 4 or less, round down
- Change the remaining numbers to zero
Example. #ul5 ul6 0 0#