Significant figures

Significant figures are the numbers that tell us how accurate a number is. For example, if you said "I have 6 apples" then the number 6 tells us that you have 6 apples. That means that the number 6 has one significant figure.

If you said "I have 6.7 apples" then the number 6.7 tells us that you have 6.7 apples. That means that the number 6.7 has three significant figures - 6, 7, and the decimal point.

The rules for significant figures are:

- All non-zero numbers are always significant.
- Zeros between two non-zero numbers are always significant.
- Zeros to the right of a decimal point and to the left of a non-zero number are always significant.
- Zeros at the end of a number without a decimal point are not always significant.