Holt CA Course Customary Measurements AF2.1 Convert one unit of measurement to another (e.g., from feet to miles, from centimeters to inches). Also covered: NS1.3 California Standards

Holt CA Course Customary Measurements You can use the following benchmarks to help you understand fluid ounces, tons, and other customary units of measure.

Holt CA Course Customary Measurements Teacher Example 1: Choosing the Appropriate Customary Unit Choose the most appropriate customary unit for each measurement. Justify your answer. A. the weight of a car tons; The weight of a car is similar to the weight of a buffalo. inches; The diameter of a soup can is similar to the length of a few paper clips. pounds; The weight of a newborn baby is similar to the weight of more than a dozen apples. B. the diameter of a soap can C. the weight of a newborn baby

Holt CA Course Customary Measurements Student Practice 1: Choose the most appropriate customary unit for each measurement. Justify your answer. A. the length of a pen top inch; The length of a pen top is similar to the length of a small paper clip. pounds; The weight of a pitcher of juice is similar to the weight of about 10 apples. cups; The capacity of a jar of peanut butter is similar to the capacity of 2 standard measuring cups. B. the weight of a pitcher of juice C. the capacity of a jar of peanut butter

Holt CA Course Customary Measurements Length 12 inches (in.)= 1 foot (ft) 3 feet = 1 yard (yd) 5,280 feet = 1 mile (mi) Weight 16 ounces (oz) = 1 pound (lb) 2000 pounds = 1 ton Capacity 8 fluid ounces (fl oz) = 1 cup (c) 2 cups = 1 pint (pt) 2 pints = 1 quart (qt) 4 quarts = 1 gallon (gal)

Holt CA Course Customary Measurements Teacher Example 2: Converting Customary Units Convert 5,000 pounds to tons. Method 1: Use a Proportion. = pounds tons 2,000 1 Write a proportion using a ratio of equivalent measures. 2,000 x = 1 5,000 2,000x = 5,000 5,000 m x x = 2.5 5,000 pounds is equal to 2.5 tons.

Holt CA Course Customary Measurements Method 2: Multiply by 1. = 5,000  5,000 lb =  5,000 lb m 1 Multiply by a ratio equal to 1, and cancel the units. Teacher Example 2: Continued Convert 5,000 pounds to tons. 1 ton t 2,000 lb 1 ton t 2,000 = 2.5 tons 5,000 pounds is equal to 2.5 tons.

Holt CA Course Customary Measurements Student Practice 2: Convert 24 pints to cups. Method 1: Use a Proportion. = cups pints 2121 Write a proportion using a ratio of equivalent measures. 1 c = 2 24 c = 48 c pints is equal to 48 cups.

Holt CA Course Customary Measurements Method 2: Multiply by 1. = 24  24 pt =  24 pt m1 Multiply by a ratio equal to 1, and cancel the units. Student Practice 2: Continued Convert 24 pints to cups. 2 ct 1 pt 2 c 1 = 48 cups 24 pints is equal to 48 cups.

Holt CA Course Customary Measurements Teacher Example 3: Converting Between Metric and Customary Units One mile is about 1.6 kilometers. What is the length in miles of a 10 kilometer race? Round to the nearest tenth of a mile. = miles kilometers x 10 Write a proportion using 1 mile  1.6 kilometers. The length of a 10 kilometer race is about 6.3 miles long. 1.6 · x = 1 · x = x 1.6 = x  6.3 Divide each side by 1.6. The cross products are equal. Multiply. Round to the nearest whole number.

Holt CA Course Customary Measurements Student Practice 3: One cup is about 8 fluid ounces. What is the amount in cups of a 35 fluid ounce container? Round to the nearest tenth of a cup. = cups fluid ounces 1818 x 35 Write a proportion using 1 cup = 8 fluid ounces. The amount of a 35 fluid ounce container is about 4.4 cups. 8 · x = 1 · 35 8x = 35 8x88x8 = 35 8 x  4.4 Divide each side by 8. The cross products are equal. Multiply. Round to the nearest whole number.