1. Zeroes between other digits are always significant. Zeroes at the end of a number are only significant if they are behind a decimal point. **405000 has 3 significant digits** (could be written 405E3)

2. Zeroes placed before other digits are not significant:

**0.0098 has 2 significant digits.**

3. All...

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1. Zeroes between other digits are always significant. Zeroes at the end of a number are only significant if they are behind a decimal point. **405000 has 3 significant digits** (could be written 405E3)

2. Zeroes placed before other digits are not significant:

**0.0098 has 2 significant digits.**

3. All non-zero digits are significant: **39.999999 has 8 significant digits**

4. Zeros behind a decimal point are significant: **13.00 has 4 significant digits.**

5. Zeroes between other digits are always significant. **80,000,089 has 8 significant digits.**

6. Zeros behind a decimal point are significant:** 55,430.00 has 7 significant digits.**

7. Zeroes placed before other digits are not significant: **0.000033 has 2 significant digits.**

8. Zeroes between other digits are always significant. Zeros behind a decimal point are significant: **620.030 has 6 significant digits.**