Question

Solve the following with round off to correct significant figures.
620.81-797.5​

Answer 1

Answer:

Explanation:

To round to a significant figure:

1) look at the first non-zero digit if rounding to one significant figure

2) look at the digit after the first non-zero digit if rounding to two significant       figures

3) draw a vertical line after the place value digit that is required

look at the next digit

4) if it's 5 or more, increase the previous digit by one

5) if it's 4 or less, keep the previous digit the same

6) fill any spaces to the right of the line with zeros, stopping at the decimal point if there is one