How do you round an answer to 3 significant figures?

1. To round to three significant figures, look at the fourth significant figure. It’s a 5 , so round up.
2. To round to four significant figures, look at the fifth significant figure. It’s a 1 , so round down.
3. To round to two significant figures, look at the third significant figure. It’s an 8 , so round up.

How do you round measurements to significant figures?

We round a number to three significant figures in the same way that we would round to three decimal places. We count from the first non-zero digit for three digits. We then round the last digit. We fill in any remaining places to the right of the decimal point with zeros.

What does 5 significant figures mean?

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.

Do you round 5 up or down significant figures?

That’s why the three tries.” “Oh!” Now that “everyone” has a calculator that will give a result to six or eight (or more) figures, it is important that we know how to round the answer off correctly. The typical rule taught is that you round up with five or more and round down with four or less.

How do you round off 5?

In rounding off numbers, if the first figure dropped is 5, and all the figures following the five are zero or if there are no figures after the 5, then the last figure kept should be unchanged if that last figure is even. For example, if only one decimal is to be kept, then 6.6500 becomes 6.6.

How do you round off example?

Here’s the general rule for rounding:

1. If the number you are rounding is followed by 5, 6, 7, 8, or 9, round the number up. Example: 38 rounded to the nearest ten is 40.
2. If the number you are rounding is followed by 0, 1, 2, 3, or 4, round the number down. Example: 33 rounded to the nearest ten is 30.

How do you find significant figures?

To determine the number of significant figures in a number use the following 3 rules:

1. Non-zero digits are always significant.
2. Any zeros between two significant digits are significant.
3. A final zero or trailing zeros in the decimal portion ONLY are significant.