Sig Figs and Rounding

  6.10m + 1.200m =

Addition rules are round to the least number of decimal places.

• 7.0m

• 7.300 m²

• 7.30m

• 7.3m

Calculate based on the rules for rounding multiplication: round to the least number of significant figures.

53.23m x 10.0m

• 5.230 m²

• 553.30 m²

• 532 m²

• 532.3 m²

Round 27,955 two significant figures.

• 27,900
• 28,955
• 28,000 or 2.8 x 10^4

• 280

• 28

Round off 1,256 to 3 significant figures

• 1,260

• 1,256

• 1,257

• 1,300

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)