Significant Figures Part 1 and 2

Significant Figures

Multiple Choice

Name the lab equipment shown in the picture.

• graduated cylinder

• flask

• beaker

• test tube

Multiple Choice

What property is a triple beam balance used to measure?

• Mass

• Volume

• Weight

• Distance

Multiple Choice

A barking dog, with long brown fur

• Quantitative Observation

• Qualitative Observation

Multiple Choice

The screwdriver is 7 cm long with a handle that is 2.3 cm long.

• Quantitative Observation

• Qualitative Observation

Multiple Choice

What is the length of the object in centimeters?

• 3.4 cm

• 4.3 cm

• 3.5 cm

• 1 ¹/₄ inches

Multiple Choice

Measure the length of this object to the nearest centimeter?

• 4 cm

• 5 cm

• 4.3 cm

• 3.4 cm

Multiple Choice

What is the length of the object in millimeters (mm)?

• 27 mm

• 7.2 mm

• 2.7 mm

• 3 mm

Multiple Choice

What is the reading at point A?

• 1.5 cm

• 1.5 mm

Multiple Select

How many significant figures are in 0.002010

• 7

• 2

• 4

• 3

Significant Figures

• Every digit of a number used to express it to the required degree of accuracy, starting from the first nonzero digit.

• There are 5 rules to determine how many "sig figs" a number has...​

Rule #1

ALL non-zero digits DO count!

​498

​

​

​3 sig figs!

​2 sig figs!

​1 sig fig!

​79

​2

Rule #2

Zeros "sandwiched" between two significant figures are significant!

​409

​

​

​5 sig figs!

​3 sig figs!

​4 sig figs!

​7006

​20004

Rule #3

PLACEHOLDER Zeros are NOT significant

​400

​

​

​1 sig fig!

​1 sig fig!

​2 sig figs!

​7500

​20

Rule #4

​498.00

​

​

​4 sig figs!

​5 sig figs!

​3 sig figs!

​ 79.0

​2.000

Rule #5

Multiple Choice

How many significant figures?

7945

• 1

• 2

• 3

• 4

Multiple Choice

How many significant figures?

0.150

• 1

• 2

• 3

• 4

Multiple Choice

How many significant figures?

76400.0

• 3

• 4

• 5

• 6

Multiple Choice

How many significant figures?

76490

• 3

• 4

• 5

• 6

Multiple Choice

The measurement 24.30 m has 3 significant figures.

• True

• False

Multiple Choice

The measurement 0.0056 g has 2 significant figures.

• True

• False

Multiple Choice

How many sig figs are there?
0.00400

• 1
• 3
• 5
• 6

Multiple Choice

How many sig figs are there?
5.00000008

• 2
• 6
• 9

Multiple Choice

How many sig figs are there?
9009.00

• 2
• 4
• 5
• 6

Multiple Choice

How many sig figs are there?
27000000

• 2
• 5
• 8

Sig figs when adding/subtracting

When adding or subtracting, round your answer to the same place as the number with the LEAST amount of DECIMALS.

​45.879 + 32.1 = 77.979

​45.879 + 32.1 = 77.979​ ------> 78.0

​5.41 + 65.456 = 70.866

​​5.41 + 65.456 = 70.866 -------> 70.87

Multiple Choice

Which one is rounded correctly for the following equation?

1.987 - 0.48 = ?

• 1.5

• 1.51

• 1.507

• 2

​Sig figs when multiplying/dividing

When multiplying or dividing, round your answer to the same place as the number with the LEAST amount of SIGNIFICANT FIGURES.

​47.06 x 1.0004 = 47.078824

​​47.06 x 1.0004 = 47.08

​98.04​ = 32.68

3​

​​98.04​ = 30

3​

Multiple Choice

Which one is rounded to the correct number of significant figures for the following equation?

7520 x 0.021 = 157.92

• 157.92

• 157.9

• 158

• 160

Multiple Choice

Which answer is rounded to the correct place for the equation below?

457.1 + 459.32 = 916.42

• 916.42

• 916.4

• 916.0

• 916

Multiple Choice

Which answer is rounded to the correct place for the equation below?

487.0 / .0024 = 121750.0

• 121750.0

• 121800

• 122000

• 120000