Mathematics Grade 7 15 min

Multiply fractions

Multiply fractions

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1

Introduction & Learning Objectives

Learning Objectives Multiply two proper or improper fractions. Multiply a fraction by a whole number. Convert mixed numbers to improper fractions and vice versa. Multiply fractions involving mixed numbers. Simplify fractions before and after multiplication to find the product in simplest form. Apply fraction multiplication to solve real-world problems. Identify and correct common errors made when multiplying fractions. Ever wondered how to figure out what 'half of a quarter' really means? 🤔 It's not just a riddle, it's about multiplying fractions! In this lesson, you'll learn the straightforward rules for multiplying fractions, including how to handle whole numbers and mixed numbers. Mastering this skill is crucial for understanding proportions,...
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Key Concepts & Vocabulary

TermDefinitionExample FractionA number that represents a part of a whole. It is written as a numerator over a denominator.In the fraction $\frac{3}{4}$, 3 is the numerator and 4 is the denominator. NumeratorThe top number in a fraction, indicating how many parts of the whole are being considered.In $\frac{2}{5}$, the numerator is 2, meaning we have 2 out of 5 equal parts. DenominatorThe bottom number in a fraction, indicating the total number of equal parts the whole is divided into.In $\frac{2}{5}$, the denominator is 5, meaning the whole is divided into 5 equal parts. ProductThe result obtained when two or more numbers are multiplied together.The product of 2 and 3 is 6. The product of $\frac{1}{2}$ and $\frac{1}{3}$ is $\frac{1}{6}$. Simplify (or Reduce)To express a fraction in its sim...
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Core Formulas

Rule for Multiplying Proper/Improper Fractions $\frac{a}{b} \times \frac{c}{d} = \frac{a \times c}{b \times d}$ To multiply two fractions, multiply their numerators together to get the new numerator, and multiply their denominators together to get the new denominator. Always simplify the final product if possible. Rule for Multiplying with Whole Numbers $n \times \frac{a}{b} = \frac{n}{1} \times \frac{a}{b} = \frac{n \times a}{1 \times b}$ To multiply a whole number by a fraction, first write the whole number as a fraction with a denominator of 1. Then, multiply the fractions as usual (numerator by numerator, denominator by denominator). Rule for Multiplying Mixed Numbers Convert mixed numbers to improper fractions first, then multiply. Before multiplying mixed numbe...

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Sample Practice Questions

Challenging
If you multiply a positive whole number by a proper fraction (a fraction less than 1), the product will be:
A.Smaller than the original whole number.
B.Larger than the original whole number.
C.Equal to the original whole number.
D.Equal to the proper fraction.
Challenging
A baker has 30 pounds of flour. He uses $\frac{2}{5}$ of the flour to make bread. Then, he uses $\frac{1}{3}$ of the remaining flour to make muffins. How many pounds of flour are left?
A.6 pounds
B.8 pounds
C.12 pounds
D.18 pounds
Challenging
If $a, b,$ and $c$ are non-zero numbers, what is the simplified product of $\frac{2a}{b} \times \frac{b}{3c} \times \frac{c}{a}$?
A.$\frac{2abc}{3abc}$
B.$\frac{2}{3}$
C.$\frac{2a^2b c}{3abc}$
D.1

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