Rounding

Rounding is the process of reducing the number of significant digits in a number. The result of rounding is a "shorter" number having fewer non-zero digits yet similar in magnitude. The result is less precise but easier to use. 
For example: 53 rounded to the nearest tenth is 50, because 53 is closer to 50 than to 60.
===Methodology===
* Decide which is the last digit (e.g., tenths, hundredths) to keep 
* Increase it by 1 if the next digit is 5 or more (known as rounding up) 
* Leave it the same if the next digit is 4 or less (known as rounding down)
 
 
===Examples:===
* 81.042 rounded to hundredths is 81.04 (because the next digit, 2, is less than 5) 
* 363.045 rounded to hundredths is 363.05 (because the next digit, 5, is 5 or more) 
* 2.0437 rounded to hundredths is 2.04 (because the next digit, 3, is less than 5)
 
===For negative numbers the absolute value is rounded===
 
Examples:
* −31.1349 rounded to hundredths is −31.13 
* −5.1350 rounded to hundredths is −5.14
Category:Pre-Algebra
Category:Crash Courses