customary measurements

CUSTOMARY MEASUREMENTSObjective: Students identify and convert customary units of measure.

CUSTOMARY MEASUREMENTS

CHOOSING THE APPROPRIATE CUSTOMARY UNITS

Choose the most appropriate customary unit for each measurement. Justify your answer. A. The length of a rug

Feet-you can use sheets of paper to measure the length

B. The weight of a magazineOunces-the weight of a magazine is about the weight of several slices of bread

C. The capacity of an aquarium Gallons-you can fill an aquarium with gallon jugs of water.

COMMON EQUIVALENT CUSTOMARY UNITS

Length Capacity12 inches (in)= 1 foot

(ft)8 fluid ounces (fl oz) = 1

cup (c)3 feet = 1 yard (yd) 2 c = 1 pint (pt)

5,280 ft = 1 mile (mi) 2 pt = 1 quart (qt)1,760 yds= 1 mi 4 qt = 1 gallon (gal)

Weight16 ounces (oz) = 1 pound (lb)

2,000 lbs = 1 ton

TRY THIS!!!Method 1: ProportionsWrite a proportion

Method 2: Multiply by 1Multiply by a ratio equal to 1 and divide out the units

Convert 19 c to fl oz

fl ozc 1 19

8 x

8 19 1x

152x

19 8191 1c fl ozc

c

19 81fl oz

152 fl oz19 cups is equal to 152 fluid

ounces

TRY THIS!!!A carpenter has a wooden post that is 4 ft long. She cuts off 17 in the end of the post. What is the remaining length?

The carpenter cuts off 17 in.

Write answer in both feet and inches

First convert 4 ft to in

inft

121 4

x

48x Use 1 ft = 12 in

4 17ft in 48 17in in 31in

31in Multiply by ratio equal to 1

112

ftin

3112

ft 7212

ft or 2ft 7in

EXAMPLE 1:Choose the most appropriate customary unit for each measurement. Justify your answer. A. The weight of a car

B. The diameter of a soup can

C. The weight of a newborn baby

EXAMPLE 2:Convert 5,000 pounds to tons.

EXAMPLE 3:Allison orders a 6 oz grilled chicken sandwich. Joseph orders a quarter lb grilled chicken sandwich. Which sandwich weights more? How much more?