Fundamentals of Mathematics, 2008a

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CHAPTER 4.
INTRODUCTION TO FRACTIONS AND MULTIPLICATION
AND DIVISION OF FRACTIONS
Division of Fractions (Section 4.6)
To divide one fraction by another fraction, multiply the dividend by the reciprocal of the divisor.
4
5 ÷ 2
15 = 4 5 · 15 2
Dividing 1 by a Fraction (Section 4.6)
When dividing 1 by a fraction, the quotient is the reciprocal of the fraction.
1
3
7
= 7 3
Multiplication Statements (Section 4.7)
A mathematical statement of the form
product = (factor 1) (factor 2)
is a multiplication statement.
By omitting one of the three numbers, one of three following problems result:
1. M = (factor 1) · (factor 2) Missing product statement.
2. product = (factor 1) · M Missing factor statement.
3. product = M · (factor 2) Missing factor statement.
Missing products are determined by simply multiplying the known factors. Missing factors are determined
by
missing factor = (product) ÷ (known factor)
4.9 Exercise Supplement 9
4.9.1 Exercise Supplement
4.9.1.1 Fractions of Whole Numbers (Section 4.2)
For Problems 1 and 2, name the suggested fraction.
Exercise 4.9.1 (Solution on p. 290.)
Exercise 4.9.2
For problems 3-5, specify the numerator and denominator.
Exercise 4.9.3 (Solution on p. 290.)
4
5
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