Quiz: Precision and Significant Digits

1. Which of the following measurements is more precise?
a. 4.123 m
b. 4.1 cm
c. 4.0 mm
2. Perform the indicated operations and give the answer in the less precise unit.
  • 6.36 km + 7.5 km – 9 km
a. 5 km
b. 4.86 km
c. 4.9 km
3. Find the number of units used for 42.3 meters if the unit of measure is 0.01 meter.
a. 42
b. 423
c. 4,230
4. Find the significant digits for 5,400 kg when the unit of measure is 100 kg.
a. 54
b. 540
c. 5,400
5. How many significant digits are there in 2,050 meters measured to 1 meter?
a. 2
b. 3
c. 4
6. How many significant digits are there in 2,050 meters measured to 10 meters?
a. 2
b. 3
c. 4
7. Find the area of a rectangle with dimensions 2.50 cm by 4.04 cm expressing the answer to the correct number of significant digits.
a. 10.10 square centimeters
b. 10.1 square centimeters
c. 10 square centimeters
8. Find the length of a rectangle with an area of 245 square inches and a width of 19 inches expressing the answer to the correct number of significant digits.
a. 12.89 inches
b. 12.9 inches
c. 13 inches

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