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7.17: Smart Shopping Extras

Difficulty Level: At Grade Created by: CK-12
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Extra for Experts – Smart Shopping - Reason Proportionally Using Least Common Multiples

Solutions

1.Least common multiple of 4 and 5 is 20. Noble's Books has the better buy. Brown: 4 for $19 is 20 for 5×$19, or $95 Noble: 5 for $23 is 20 for 4×$23, or $92 $95>$92

2.Least common multiple of 2 and 4 is 4. Brown's Books has the better buy. Brown: 2 for $25 is 4 for 2×$25, or $50 Noble: 4 for $51 $50<$51

3.Least common multiple of 4 and 6 is 12. Noble's Books has the better buy. Brown: 4 for $37 is 12 for 3×37, or $111 Noble: 6 for $49 is 12 for 2×$49, or $98 $111>$98

What is the least common multiple of 4 and 5? Which store has the better buy? How did you figure it out?

What is the least common multiple of 2 and 4? Which store has the better buy? How did you figure it out?

What is the least common multiple of 4 and 6? Which store has the better buy? How did you figure it out?

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CK.MAT.ENG.SE.1.Algebra-Explorations-K-7.7.17
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