Mathematics Grade 8 15 min

Mixed customary units

Mixed customary units

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Introduction & Learning Objectives

Learning Objectives Identify and define common customary units for length, weight, and capacity. Convert between different customary units within a mixed unit expression. Add and subtract mixed customary units, simplifying the results. Multiply and divide mixed customary units by whole numbers or fractions. Solve real-world problems involving operations with mixed customary units. Express measurements in their simplest mixed customary unit form. Ever tried to bake a cake and the recipe calls for '1 cup and 6 fluid ounces' of milk? 🥛 How do you measure that, or even double it? In this lesson, we'll dive into 'mixed customary units' – measurements that combine different units, like 'feet and inches' or 'pounds and ounces'. You&#0...
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Key Concepts & Vocabulary

TermDefinitionExample Customary UnitsA system of measurement primarily used in the United States, including units for length (inches, feet, yards, miles), weight (ounces, pounds, tons), and capacity (fluid ounces, cups, pints, quarts, gallons).Length: 5 feet; Weight: 10 pounds; Capacity: 2 gallons. Mixed Customary UnitsA measurement expressed using two or more different customary units for the same quantity, where one unit is larger than the other.3 feet 8 inches (length), 2 pounds 5 ounces (weight), 1 gallon 3 quarts (capacity). Conversion FactorA ratio (fraction) used to convert one unit of measurement to another, where the numerator and denominator are equivalent measurements in different units.To convert feet to inches, use the conversion factor $\frac{12 \text{ inches}}{1 \text{ foot...
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Core Formulas

Customary Unit Equivalences (Conversion Factors) Length: $1 \text{ foot} = 12 \text{ inches}$, $1 \text{ yard} = 3 \text{ feet}$, $1 \text{ mile} = 5280 \text{ feet}$. Weight: $1 \text{ pound} = 16 \text{ ounces}$, $1 \text{ ton} = 2000 \text{ pounds}$. Capacity: $1 \text{ cup} = 8 \text{ fluid ounces}$, $1 \text{ pint} = 2 \text{ cups}$, $1 \text{ quart} = 2 \text{ pints}$, $1 \text{ gallon} = 4 \text{ quarts}$. These equivalences are essential for converting between different customary units. To convert from a larger unit to a smaller unit, multiply. To convert from a smaller unit to a larger unit, divide. Adding and Subtracting Mixed Customary Units 1. Align units vertically. 2. Add or subtract the smaller units first. 3. If necessary, 'borrow' from or 'carry...

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Sample Practice Questions

Challenging
The combined height of two stacked boxes is 8 feet 2 inches. The taller box is 1 foot 10 inches taller than the shorter box. What is the height of the shorter box?
A.3 feet 2 inches
B.4 feet 1 inch
C.5 feet 0 inches
D.2 feet 8 inches
Challenging
A full sack of potatoes weighs 10 pounds 8 ounces. If a family eats 3/4 of the sack, what is the weight of the potatoes they ate?
A.7 pounds 8 ounces
B.7 pounds 14 ounces
C.8 pounds 2 ounces
D.8 pounds 6 ounces
Challenging
A painter starts with a 5-gallon can of paint. He uses 1 gallon 2 quarts to paint the living room and 3 quarts 1 pint to paint the hallway. How much paint is left, expressed in gallons, quarts, and pints?
A.2 gallons 2 quarts 1 pint
B.2 gallons 1 quart 1 pint
C.3 gallons 0 quarts 1 pint
D.3 gallons 1 quart 1 pint

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