# Significant Digits and Scientific Notation Part 1: Determine the number of significant digits in each number and write out the specific significantÂ digits. 1. 405000 2. 0.0098 3. 39.999999 4....

Significant Digits and Scientific Notation

Part 1: Determine the number of significant digits in each number and write out the specific significantÂ digits.

1. 405000

2. 0.0098

3. 39.999999

4. 13.00

5. 80,000,089

6. 55,430.00

7. 0.000033

8. 620.030

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### 1 Answer

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.**