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Did you know that only three countries in the world, out of over 200,
have not adopted the metric system as their universal system of measure?

 From https://worldpopulationreview.com/:"Three countries in the world do not use the metric system as the official system of measurement: the United States, Liberia (west Africa), and Myanmar (South Asia). The United States' reluctance to fully adopt the metric system stems from when the British colonized the New World, bringing the Imperial System with them. After independence, secretary of state Thomas Jefferson insisted on using the imperial measurement system despite Congress proposing to use the metric system. The metric system is used in the United States, but it is not the official system of measurement. Liberia was founded by the American Colonization Society; therefore, Liberia's laws were founded based on the American Constitution. Because of the country's close association with the United States, Liberia still uses the imperial measurement system. The government, however, is in the process of adopting the metric system. Myanmar isolated itself after gaining independence from Britain; therefore, it never required a common measurement system with the rest of the world. After using its own traditional forms of measurements, Myanmar is in the process of adopting the metric system now that it is open to the rest of the world. It is likely that the United States will soon be the only country in the world that has not fully adopted the metric system. Here is another article on the struggle the U.S. is having fully converting to the metric system.

Customary System (U.S., Liberia, Myanmar)
 Measurement 1Measure to the nearest inch, half inch, and quarter inch. Measurement 2Measure to the nearest inch, half inch, and quarter inch. Measurement 3Measure to the nearest whole,half, quarter, and eighth inch. Measurement 4Measure to the nearestsixteenth inch.
Metric System (All Other Countries in the World)
 Measurement 5Measure to the nearest centimeter & exact millimeter. Measurement 6Measure & compare with centimeters & millimeters. Measurement 7Measure with fractions of inches, cm & mm, with the ruler misplaced. Measurement 8Enter measured values for centimeters, millimeters, & inches.
More Measurement Activities
 Measurement 9Convert the standard measure to decimals, using a conversion chart. Parts of an Inch 1 Parts of an Inch 2 Interactive Practice for Beginners
 Recording Sheets