Table of Contents

- 1 How do you determine the last digit in a measured number?
- 2 How do you determine the number of significant figures when you make a measurement?
- 3 What is the estimated digit in a number?
- 4 What number is significant?
- 5 How many significant figures does 0.05 have?
- 6 How many significant figures does 1000000 have?

## How do you determine the last digit in a measured number?

How do you determine the last digit in any measured number? by the tool you are using. The last number in a measured number is always an estimated digit.

## How do you determine the number of significant figures when you make a measurement?

Use the least number of significant figures past the decimal point when adding or subtracting numbers. For example, the answer to 123.45 + 543.2 would have 1 significant figure past the decimal point.

**Why is the last digit in measurement estimate?**

When taking a measurement, the last digit is an estimate. This estimate helps other scientists determine with what precision the measurement was made. All measurements have an estimated value. The digit prior to the estimate is always a mark on the device.

**What is the last digit of a significant number?**

(a) are the last digit of a measurement as long as they are to the right of the decimal point (b) come between two other significant digits. Example 2: 3.70 has three significant digits. The zero is significant because it is the last digit. Example 4: 1.500 has four significant digits.

### What is the estimated digit in a number?

The number of digits that you write down for a measurement is called the number of significant digits (or significant figures) in the measurement. Scientists understand that the last digit (and only the last digit) in a measurement is an estimate.

### What number is significant?

All non-zero digits are considered significant. For example, 91 has two significant figures (9 and 1), while 123.45 has five significant figures (1, 2, 3, 4, and 5). Zeros appearing between two non-zero digits (trapped zeros) are significant. Example: 101.12 has five significant figures: 1, 0, 1, 1, and 2.

**Which of the following is a correct rule for counting 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 the measurement 1.50 have?**

3 significant figures

1.5 x 102 has 2 significant figures whereas 1.50 x 102 has 3 significant figures.

#### How many significant figures does 0.05 have?

0.05 – one significant figure (5); the leading zeroes are ignored. 0.0501 – three significant figures (5, 0, 1); the leading zeroes are ignored, the third zero is enclosed by two non-zero digits and is therefore significant.

#### How many significant figures does 1000000 have?

The zeros at the end of an integer do not count as significant. 1000 has only 1 sig. fig. . 1,000,000 has only 1 sig.

**How many significant digits does 1.00 have?**

How Many Significant Figures?

Number | Scientific Notation | Significant Figures |
---|---|---|

100.000 | 1.0×102 | 6 |

100.00 | 1.0×102 | 5 |

10 | 1.0×101 | 1 |

1261.63 | 1.26163×103 | 6 |

**How many significant figures does the number 0.054901 have?**

How many significant figures does the number 0.054901 have? 5 -Count the number of significant figures.