Significant Figures Part 3

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By Victor Castillo

Significant Figures in Multiplication and Division

For multiplication and division use the following rule: 

The LEAST number of significant figures in any number of the problem determines the number of significant figures in the answer. (You are now looking at the entire number, not just the decimal portion)

*This means you have to be able to recognize significant figures in order to use this rule*      

Example: 5.26 has 3 significant figures; 6.1 has 2 significant figures

Multiple Choice

3.11 x 2.1 =

• 6.531

• 6.53

• 6.5

• 7

• 6

Multiple Choice

Calculate 1.23 m x 0.89 m and give your answer with the correct number of significant figures.

• 1.0 m²
• 1.1 m²
• 1.0947 m²
• 1.095 m²

Multiple Choice

Calculate 923 g ÷ 20312 cm³ and give your answer with the correct number of significant figures.

• 0.04 g/cm³
• 0.045 g/cm³
• 0.0454 g/cm³
• 0.05 g/cm³

Multiple Choice

Calculate 12.47 m ÷ 3.2 s and give your answer with the correct number of significant figures.

• 4 m/s
• 3.9 m/s
• 3.90 m/s
• 3.897 m/s

Multiple Choice

Calculate 0.020 cm x 50 cm x 11.1 cm and give your answer with the correct number of significant figures.

• 10 cm³
• 11.1 cm³
• 11 cm³
• 11. cm³

Multiple Choice

Multiply 5.4L x 8.99g/L

• 49g
• 48.5g
• 48.55g
• 48.546g

Multiple Choice

Divide 100.00g / 2.00mL

• 50 g/mL
• 5.0 x 10¹ g/mL
• 50.0 g/mL
• 50.00 g/mL

Multiple Choice

Divide 8.953 g by 4.52mL

• 2 g/mL
• 2.0 g/mL
• 1.98 g/mL
• 1.981 g/mL

Multiple Choice

When multiplying and dividing measured quantities, the number of significant figures in the result should be equal to the number of significant figures in ____.

• all of the measurements

• the least and most precise measurements the most precise

• measurement

• the least precise measurement