Rounding Numbers and Significant Figures

Front

What is rounding in mathematics?

Back

Rounding is the process of adjusting the digits of a number to make it simpler or to make it easier to work with, while keeping its value close to what it was.

Front

What are significant figures?

Back

Significant figures are the digits in a number that contribute to its precision. This includes all non-zero digits, any zeros between significant digits, and trailing zeros in the decimal portion.

Front

How do you round a number to one significant figure?

Back

To round a number to one significant figure, identify the first non-zero digit and round the number based on the digit immediately following it.

Front

What is 78.5 rounded to one significant figure?

Back

80

Front

What is 0.658 rounded to one significant figure?

Back

0.7

Front

How do you round a number to four significant figures?

Back

To round a number to four significant figures, identify the first four significant digits and round based on the digit immediately following the fourth significant digit.

Front

What is 0.010229 rounded to four significant figures?

Back

0.01023

Front

What is the rule for rounding up?

Back

If the digit immediately after the last significant figure is 5 or greater, round up the last significant figure by one.

Front

What is the rule for rounding down?

Back

If the digit immediately after the last significant figure is less than 5, keep the last significant figure the same.

Front

What is 8291 rounded to one significant figure?

Back

8000