Significant Figures in Calculations

Calculate 7.987 m + 0.54 m and give your answer with the appropriate number of significant figures.

• 8.50 m

• 8.53 m

• 8.60 m

• 8.55 m

What is the rule for addition and subtraction regarding significant figures?

• The result should be reported to the least number of decimal places of any number in the operation.

• The result should be reported to the greatest number of decimal places of any number in the operation.

• The result should be rounded to the nearest whole number regardless of decimal places.

• The result can have any number of decimal places as long as it is accurate.

Calculate 24.57 / 11 and give your answer with the appropriate number of significant figures.

• 2.2

• 2.3

• 2.1

• 2.0

70,000

How many sig figs?

• 0

• 1

• 3

• 5

Calculate 81.04 x 0.010 and give your answer with the appropriate number of significant figures.

• 0.81

• 0.80

• 0.82

• 0.75

What is the rule for multiplication and division regarding significant figures?

• The result should be reported to the least number of significant figures of any number in the operation.

• The result should be reported to the greatest number of significant figures of any number in the operation.

• The result should be reported with no significant figures.

• The result should be rounded to the nearest whole number.

How do you round a number to the correct number of significant figures?

• Look at the digit immediately after the last significant figure. If it is 5 or greater, round up the last significant figure.

• Always round down regardless of the next digit.

• Round to the nearest whole number without considering significant figures.

• Ignore the next digit and keep the last significant figure as is.

0.007500

How many sig figs?

• 2

• 3

• 4

• 5

Calculate 345.009 g - 23.009 g and give your answer with the appropriate number of significant figures.

• 320.000 g

• 322.000 g

• 325.000 g

• 330.000 g

14.6000

How many sig figs?

• 4 sig figs

• 5 sig figs

• 6 sig figs

• 7 sig figs