Measurements, Sig Figs and Rounding

Round 27,955 two significant figures.

• 27,900
• 28,955
• 28,000
• 280

• 28

Round off 1,256,717 to 3 significant figures

• 1,260,000

• 1,256,000

• 1,257,000

• 1,300,000

What is 78.5 rounded to one significant figure?

• 79

• 78.5

• 70

• 80

Complete the following calculations. Round off your answers as needed for multiplication: round to the least significant figures.

245.01 km x 2.1 km

• 5.14521 x 10²

• 510 km2

• 514 km2

• 514.521 km2

Complete the following calculations. Round off your answers as needed for addition: round to the least # of decimal places.

52.6 g + 309.1 g +77.214 g

• 438.9 g

• 438.914 g

• 438.91 g

• 4.38914 x 10²

Calculate then round based on the rules for subtraction: round to the least # number of decimal places.

25 g-2.005 g =

• 23 g

• 22.995 g

• 23.0

• 22.99

Answer the question focusing on the units: 2 m + 3 m = ?

• 5 m

• 5 m2 (meters squared)

Answer the question focusing on the units.

5 m x 5 m = ?

• 25 m

• 25 m2 (meters squared)

How many sig figs are in the following measurement?

2.4050 X 10^-3

• 1

• 2

• 3

• 4

• 5

What is the length of the object in centimeters?

• 3.40 cm

• 4.3 cm

• 3.5 cm

• 1 ¹/₄ inches