Writing Ratios: cm and in.

The video tutorial explains the US and metric systems of measurement, focusing on converting between inches and centimeters. It introduces the concept of ratios and demonstrates how to use them for conversions. Examples include converting inches to centimeters and vice versa, with practical scenarios like buying a pipe or measuring ribbon. The tutorial emphasizes the importance of understanding unit conversions in everyday situations.

Which of the following is NOT a common unit of length in the US system?

• Inches

• Feet

• Meters

• Yards

If 1 inch equals 2.54 centimeters, how many centimeters are in 3 inches?

• 12.70 cm

• 10.16 cm

• 7.62 cm

• 5.08 cm

What is the ratio of inches to centimeters?

• 2:2.54

• 1:3.14

• 2:5.4

• 1:2.54

Catherine has a ribbon that is 15 centimeters long. Approximately how many inches is this?

• 8 inches

• 7 inches

• 6 inches

• 5 inches

To convert centimeters to inches, you should:

• Multiply by 2.54

• Divide by 3.14

• Divide by 2.54

• Multiply by 3.14