Transcript Multiplying and Dividing Rational Numbers Review

COURSE 3 LESSON 4-5
Multiplying and Dividing Rational Numbers
Solve 3 y + 2 = – 1 .
4
8
3
y+2=– 1
4
8
3
1
y
=
–2
4
8
1
1
1
Subtract 2 from each side.
1
4 3
4
17
•
y
=
•
–
3 4
3
8
1
2
1 • 17
1y = – 3 • 2
Multiply each side by the reciprocal of 3 and
4
change the mixed number to an improper
fraction.
Multiply numerators and denominators
on each side.
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COURSE 3 LESSON 4-5
Multiplying and Dividing Rational Numbers
(continued)
y=–
17
6
y = –2 5
6
Simplify.
Write as a mixed number.
Check for Reasonableness Round the numbers in the equation to
1y + 2 = 0. The solution to this equation is –2. The answer is reasonable.
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COURSE 3 LESSON 4-5
Multiplying and Dividing Rational Numbers
1. 5 • (– 4 )
8
5
–1
2. 2 1 • (–1 1 )
3
8
–2 5
2
8
3. – 1 ÷ (– 3 )
6
4
4. (–1 7 ) ÷ (1 1 )
8
–1 1
2
9
4
4-5
2
COURSE 3 LESSON 4-5
Multiplying and Dividing Rational Numbers
1. 5 • (– 4 )
8
5
–1
2. 2 1 • (–1 1 )
3
8
–2 5
2
8
3. – 1 ÷ (– 3 )
6
4
4. (–1 7 ) ÷ (1 1 )
8
–1 1
2
9
4
4-5
2