What are the 3 Rules for significant figures?
To determine the number of significant figures in a number use the following 3 rules:
- Non-zero digits are always significant.
- Any zeros between two significant digits are significant.
- A final zero or trailing zeros in the decimal portion ONLY are significant.
How many significant figures does 10000 have?
How Many Significant Figures?
| Number | Scientific Notation | Significant Figures |
|---|---|---|
| 10000 | 1.0×104 | 1 |
| 0.0010 | 1.0×10-3 | 3 |
| 15.0 | 1.5×101 | 3 |
| 15.0 | 1.5×101 | 3 |
How many significant figures does 210 have?
Rounding
| Number of Significant Figures | Rounded Value | |
|---|---|---|
| 5 | 207.52 | 8 rounds the 1 up to 2 |
| 4 | 207.5 | 2 is dropped |
| 3 | 208 | 5 rounds the 7 up to 8 |
| 2 | 210 | 8 is replaced by a 0 and rounds the 0 up to 1 |
How many significant figures does 2001800 have?
Rounded to Fewer Sig Figs
| 6 | 2001800 | 2.00180 × 106 |
|---|---|---|
| 5 | 2001800 | 2.0018 × 106 |
| 4 | 2002000 | 2.002 × 106 |
| 3 | 2000000 | 2.00 × 106 |
| 2 | 2000000 | 2.0 × 106 |
How many significant figures does 1.90 have?
3 significant digits
How many significant figures does 40 have?
1 significant figure
How many significant figures does 1003 have?
For 1003, 1 and 3 are obviously significant, so using rule #4, every digit inbetween must also be significant.
How many significant figures does 320 have?
two significant digits
How many significant figures are there in 350?
three significant digits