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Definition:
There are two primary systems of measurements. Customary system and metric system. The customary system is the system of measurement primarily used in the United States while the metric system is the system of measurement commonly used in science.
Summary:
The Customary System of Measurement
- The customary system of measurement, also known as the U.S. Customary System, is based on the English system of measurement.
- In mathematics context, the customary system refers to a set of weights and measures used for measuring length, weight, capacity and temperature.
The customary system for length and distances are measured in inches, feet, yards and miles.
| CUSTOMARY UNIT | CUSTOMARY EQUIVALENT |
| 1 inch (in) | — |
| 1 foot (ft) | 12 inches |
| 1 yard (yd) | 3 feet |
| 1 mile (mi) | 1760 yards |
The U.S. customary weight measurement units are ounces, pounds, and tons.
| CUSTOMARY UNIT | CUSTOMARY EQUIVALENT |
| 1 ounce (oz) | 16 drams |
| 1 pound (lb) | 16 ounces |
| 1 ton (t) | 2000 pounds |
The U.S customary capacity or volume measurement units are ounces, cups, pints, quarts, and gallons.
| CUSTOMARY UNIT | CUSTOMARY EQUIVALENT |
| 1 fluid ounce | 2 tablespoons |
| 1 cup | 8 fluid ounces |
| 1 pint | 2 cups |
| 1 quart | 2 pints |
| 1 gallon | 4 quarts |
The Metric System of Measurement
- This system of measurement is being considered as the international decimal system of weights and measures, based on the metre for length and the kilogram for mass.
- It is commonly used in France in 1795 and is now used officially in almost all nations in the world.
| Length | Weight | Volume |
| 1 km = 1,000 m | 1 kg = 1,000 g | 1 kL = 1,000 L |
| 1 m = 0.001 km | 1 g = 0.001 kg | 1 L = 0.001 kL |
| 1 m = 100 cm | 1 g = 100 cg | 1 L = 100 cL |
| 1 cm = .01 m | 1 cg = 0.01 g | 1 cL = 0.01 L |
| 1 m = 1, 000 mm | 1 g = 1,000 mg | 1 L = 1,000 mL |
| 1 mm = 0. 001 m | 1 mg = 0.001 g | 1 mL = 0.001 L |
Here’s a copy of customary-metric conversion chart.
| Customary Unit | Metric Unit |
| 1 inch | 25.4 millimeters |
| 1 foot | 30.48 centimeters |
| 1 yard | 0.91 meter |
| 1 mile | 1.61 kilometers |
| 1 teaspoon | 4.93 milliliters |
| 1 cup | 0.24 liter |
| 1 pint | 0.47 liter |
| 1 quart | 0.95 liter |
| 1 gallon | 3.79 liters |
| 1 ounce | 28.35 grams |
| 1 pound | 0.45 kilogram |
In converting larger units to smaller units, we multiply the number of larger units by the conversion factor for the appropriate smaller units.
Converting Like Measurement Units Worksheets
This is a fantastic bundle which includes everything you need to know about Converting Like Measurement Units across 15+ in-depth pages. These are ready-to-use Common core aligned Grade 5 Math worksheets.
Each ready to use worksheet collection includes 10 activities and an answer guide. Not teaching common core standards? Don’t worry! All our worksheets are completely editable so can be tailored for your curriculum and target audience.
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