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Solve multiplication equations. formula Main Idea/Vocabulary

KC 1

Solve Multiplication Equations Solve 39 = 3y. Check your solution. 39 = 3y Write the equation. Divide each side of the equation by 3. 13 = y 39 ÷ 3 = 13 Answer: The solution is 13. Check 39 = 3y Write the original equation. 13 = 3(13) Replace y with 13. ? 39 = 39  Example 1

Solve 6m = 42. Check your solution. A. 3 B. 7 C. 36 D. 48 A B C D Example 1

Solve Multiplication Equations Solve –4z = 60. Check your solution. –4z = 60 Write the equation. Divide each side of the equation by –4. z = 15 60 ÷ (–4) = –15 Answer: The solution is –15. Check –4z = 60 Write the original equation. –4(–15) = 60 Replace z with –15. ? 60 = 60  Example 2

Solve –64 = –16b. Check your solution. A. –48 B. –4 C. 4 D. 80 A B C D Example 2

Variable Let n represent the number of invitations mailed. MAIL Serena went to the post office to mail some party invitations. She had $6.15. If each invitation needed a $0.41 stamp, how many invitations could she mail? Words Total is equal to cost of each stamp times number of invitations mailed. Variable Let n represent the number of invitations mailed. Equation 6.15 = 0.41n Example 3

Answer: Serena could mail 15 invitations. 6.15 = 0.41n Write the equation. 15 = n 6.15 ÷ 0.41 = 15 Answer: Serena could mail 15 invitations. Example 3

TRAVEL Jordan drove 273. 6 miles in 4. 8 hours TRAVEL Jordan drove 273.6 miles in 4.8 hours. What was Jordan’s average speed? A. 57 mph B. 58 mph C. 60 mph D. 62 mph A B C D Example 3

Answer: It would take Ms. Wang 5 hours to swim 3 miles. SWIMMING Ms. Wang swims at a speed of 0.6 mph. At this rate, how long will it take her to swim 3 miles? You are asked to find the time t it will take to travel a distance d of 3 miles at a rate r of 0.6 mph. d = rt 3 = 0.6t Answer: It would take Ms. Wang 5 hours to swim 3 miles. Example 4

COOKIES Debbie spends $6. 85 on cookies at the bakery COOKIES Debbie spends $6.85 on cookies at the bakery. The cookies are priced at $2.74 per pound. How many pounds of cookies did Debbie buy? A. 1.75 pounds B. 2.5 pounds C. 2.75 pounds D. 4.11 pounds A B C D Example 4

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