1. Using a Ruler to Measure USCS to Metric / SI
Basic Measurements
Using a Ruler to Measure USCS to Metric / SI

2. Objectives - SWBAT Read and Understand a US Customary Ruler
Read and Understand a Metric / International System of Units Ruler
Convert Inches to fractions of inches and decimal
Convert CM to MM on a Metric Ruler
Convert Inches to CM
Find specific Measurements in any scale on a ruler.

3. Why Different Measurements
In the US, we use the Customary System ( USCS ) to read rulers. These are broken down into Feet, Inches, and fractions of inches.
Everywhere outside of the US, the Metric System is used. It is broken down into Meters, Cm (centimeters), and Mm (millimeters).
Currently, the Metric system is being updated. While most of the measurements will be the same, some will change. This new system is known as The International System of Units, or SI for short.

4. Understanding USCS 1 1 2

5. Understanding USCS 1 1 2 1 4 1 4 1 8

6. Understanding USCS 1 1 16 1 16 1 16 1 16 1 16 1 16 1 16 1 16

7. Understanding USCS 1 10 16 5 8

8. Understanding USCS 1 7 16

9. Understanding USCS 1 2 11 16 1

10. Understanding METRIC / SI
0 cm
1 cm
Centimeters are divided into 10 Millimeters
10 mm = 1 cm cm = 1 meter inch = 2.54 cm

11. Understanding METRIC / SI
0 cm
1 cm
6 mm or .6 cm

12. Understanding METRIC / SI
0 cm
1 cm
3 mm or .3 cm

13. Understanding METRIC / SI
1 inch = 2.54 centimeters
How many centimeters is 4 inches?
4 x 2.54 = centimeters
How many centimeters is 1 foot?
12 x 2.54 = centimeters
How many inches and is 72 centimeters?
72 ÷ = inches ÷ 12 = 2.36 feet

14. Complete Measurement worksheet
In Hand-Out Folder, or on the Website. Everyone must do their own.