Unit 2: Mastering Measurement and Calculations

Match each measurement below to the number of significant figures it contains.

• 2 significant figures

• 0.0450

• 3 significant figures

• 0.4500

• 3 significant figures (with a different decimal placement)

• 0.045

• 4 significant figures

• 0.00450

Zoe is conducting an experiment to find the density of a metal block. She needs to record the density in the correct SI unit. The SI unit for density is (a)   .

• kilo-
• centi-
• milli-
• micro-

Scarlett measures the length of a pencil and records it as 12.34 cm. The estimated digit in her measurement is (a)   .

• 1
• 2
• 3
• 4

Maya is measuring the thickness of a thin sheet, and her measurement reads 0.00056 meters. The correct scientific notation for Maya's measurement is (a)  

Abigail is measuring the length of a table with a ruler. She wants to know if her measurement is accurate. Accuracy is best defined as (a)  

• How close measurements are to each
• How close a measurement is to the t
• The number of decimal places in a m
• The ability to repeat a measurement

Olivia measures the mass of a small sample and records it as 0.02030 grams. The number of significant figures in her measurement is (a)   .

• 2
• 3
• 4
• 5

Anika is preparing a recipe that calls for 2500 mL of water. She needs (a)   liters of water.

• 0.25 L
• 2.5 L
• 25 L
• 250 L

• 0.345
• 345
• 34.5
• 3,450

• 5.67 g
• 0.02 g
• 0.2 g
• 0.002 g