Significant figures are the scientist’s preferred method of expressing uncertainty in their measurements. For new students, learning the rules of significant figures is easyâ€”applying them is the problem.

This significant figures worksheet PDF contains 20 different addition and subtraction problems for the student to calculate the solution to the correct number of significant figures.

Download the PDF of this worksheet or click the above image to print as many copies as you need.

The answer key is below. More chemistry worksheets and handouts are available for printing.

For other Significant Figure Worksheets, check out:

Significant Figures Worksheet

Significant Figures – MultiplicationÂ Worksheet

### Answer Key for Significant Figures Worksheet

Here is the Answer Key PDF.

10000 would be correct because 20 only has 1 significant digit. One way to determine the number of significant digits is to write the numbers using scientific notation. You’d have 12000 is 1.2 x 10e4 and 20 is 2 x 10e1. Use the smallest number of significant digits (which would be one in this case).

no that would be incorrect the answer should be rounded to the thousands place! So it should be 12,000. Because the least precise number is 12,000