Least Common Multiple and Percentages

This video tutorial covers unit 7 lesson 17 on common multiples. It includes problems involving blinking lights, listing multiples, and finding least common multiples (LCM) for various scenarios. The tutorial also addresses a coordinate plane problem and a fundraising goal calculation, providing step-by-step solutions and explanations.

If a green light blinks every 4 seconds and a yellow light blinks every 5 seconds, how often will they blink together?

• Every 25 seconds

• Every 20 seconds

• Every 15 seconds

• Every 10 seconds

What is the least common multiple of 12 and 9?

• 36

• 24

• 48

• 18

How do you determine when two lights will blink together?

• Add their blinking intervals

• Find the least common multiple

• Subtract their blinking intervals

• Find the greatest common divisor

What are the multiples of 10 up to 100?

• 10, 20, 30, 40, 50, 60, 70, 80, 90, 100

• 5, 10, 15, 20, 25, 30, 35, 40, 45, 50

• 12, 24, 36, 48, 60, 72, 84, 96

• 15, 30, 45, 60, 75, 90

What is the least common multiple of 10 and 15?

• 30

• 35

• 25

• 20

If cups are sold in packages of 8 and napkins in packages of 12, how many packages of each are needed to have the same number of items?

• 1 package of cups and 4 packages of napkins

• 3 packages of cups and 2 packages of napkins

• 2 packages of cups and 3 packages of napkins

• 4 packages of cups and 1 package of napkins

How many sets of cups and napkins will there be if the least common multiple is 24?

• 12 sets

• 24 sets

• 18 sets

• 30 sets

If a school has raised 20% of its $2,500 goal, how much money has it raised?

• $1,000

• $750

• $500

• $250

What is 1% of the $2,500 goal?

• $25

• $20

• $15

• $30

If the school raises 175% of its goal, how much money will the music program receive?

• $4,375

• $3,750

• $5,000

• $5,625