Significant Digits Practice
This worksheet helps grade 9 students practice identifying and using significant digits in various mathematical contexts, including measurement and calculations.
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Significant Digits Practice
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Read each question carefully and provide your answer in the space provided. Pay close attention to significant digits in all calculations and answers.
Determine the number of significant digits in each of the following measurements:
1. 0.0050 g:
2. 120.0 m:
3. 500 cm:
4. 2.050 x 10^3 kg:
5. 78000 s:
6. Round 3.14159 to three significant digits.
3.14
3.141
3.15
3.142
7. How many significant digits are in the number 0.00708?
3
4
5
6
Perform the following calculations and express your answer with the correct number of significant digits.
8. What is the sum of 12.5 cm and 1.34 cm?
9. Calculate the product of 2.5 m and 3.45 m.
10. A rectangular plot of land measures 15.2 meters by 10.0 meters. What is its area?
Indicate whether each statement is true or false regarding significant digits.
11. All non-zero digits are always significant.
True
False
12. Trailing zeros are always significant if there is a decimal point present.
True
False
13. A student measures the length of a pencil using a ruler. The ruler has markings for every millimeter. The student records the length as 15.3 cm.
a) How many significant digits are in this measurement?
b) If the student used a ruler with markings for every centimeter (but not millimeters), what would be an appropriate way to record the length, maintaining correct significant digits?
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