Mathematics
Grade 7
15 min
Fraction word problems
Fraction word problems
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1
Introduction & Learning Objectives
Learning Objectives
Identify key information and operations in word problems involving fractions and decimals.
Accurately convert fractions to decimals and vice versa within word problem contexts.
Perform addition, subtraction, multiplication, and division with decimals to solve word problems.
Solve multi-step word problems that combine fractions and decimals.
Interpret the solution of a decimal word problem in the context of the original problem.
Estimate answers to decimal word problems to check for reasonableness.
Ever wonder how much pizza is left if your friend ate 1/4 and you ate 0.3 of it? 🍕 Today, we'll learn how to solve real-world problems that mix fractions and decimals!
In this lesson, you'll learn how to tackle word problems that involve both fractio...
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Key Concepts & Vocabulary
TermDefinitionExample
FractionA number that represents a part of a whole, expressed as a ratio of two integers (numerator over denominator).1/2, 3/4, 5/8
DecimalA number that uses a decimal point to represent a part of a whole, where the digits to the right of the decimal point represent fractions with denominators that are powers of ten.0.5 (which is 5/10), 0.75 (which is 75/100), 2.3 (which is 2 and 3/10)
Word ProblemA mathematical problem presented in a narrative or story format, requiring you to extract information and apply mathematical operations to find a solution.Sarah has 2.5 meters of ribbon. She uses 1/4 of it. How much ribbon is left?
ConversionThe process of changing a number from one form to another, such as changing a fraction to a decimal or a decimal to a fraction, withou...
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Core Formulas
Converting a Fraction to a Decimal
To convert a fraction $\frac{a}{b}$ to a decimal, divide the numerator ($a$) by the denominator ($b$).
This rule is essential when a word problem mixes fractions and decimals, and you need to perform operations consistently in one form. For example, $\frac{3}{4} = 3 \div 4 = 0.75$.
Performing Operations with Decimals
For addition and subtraction, align the decimal points. For multiplication, multiply as whole numbers and then place the decimal point by counting the total decimal places in the factors. For division, make the divisor a whole number by moving its decimal point, and move the dividend's decimal point the same number of places.
Once you've converted all numbers in a word problem to decimals, these are the standard proce...
5 more steps in this tutorial
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Challenging
A full gas tank holds 40 liters. The driver uses 1/4 of the tank on Monday and 1/3 of the *remaining* gas on Tuesday. On Wednesday, they add 5.75 liters. How much gas is in the tank at the end of Wednesday?
A.25.75 liters
B.14.25 liters
C.20.0 liters
D.15.75 liters
Challenging
A recipe for 12 cookies requires 1.5 cups of flour and 3/4 cup of sugar. How much total flour and sugar, in cups, are needed to make 30 cookies?
A.2.25 cups
B.4.125 cups
C.5.625 cups
D.7.5 cups
Challenging
A fabric roll is 2.5 meters long. A tailor cuts off 1/4 of the roll for a shirt. From the remaining piece, they cut as many 12.5-centimeter-wide strips as possible. How many full strips can they cut?
A.14 strips
B.15 strips
C.18 strips
D.20 strips
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