GCF & LCM In Real-Life

Your favorite radio station is doing a giveaway. Every 5th caller wins a new music player and every 7th caller wins concert tickets. You are the first person to win both prizes. What number caller were you?

Is this a GCF or an LCM Question?

• GCF

• LCM

• Can't Tell

ANSWER: Your favorite radio station is doing a giveaway. Every 5th caller wins a new music player and every 7th caller wins concert tickets. You are the first person to win both prizes. What number caller were you?

• 5

• 7

• 35

• 70

In High School, Savannah spends $7 on lunch every day and Michaela spends $9 on lunch every day. On the day that the girls have spent the same total amount of money, how many days did it take Savannah to do so?

Is this a GCF or LCM question?

• GCF

• LCM

• Can't Tell

ANSWER: In High School, Savannah spends $7 on lunch every day and Michaela spends $9 on lunch every day. On the day that the girls have spent the same total amount of money, how many days did it take Savannah to do so?

• 1

• 7

• 9

• 63

Rachel is a gym teacher and has 25 girls and 35 boys in her class. She wants to divide the class into teams of the same size, where each team has the same number of girls and the same number of boys. If Rachel creates the greatest number of teams possible, how many boys will be on each team?

Is this a GCF or LCM question?

• GCF

• LCM

• Can't Tell

ANSWER: Rachel is a gym teacher and has 25 girls and 35 boys in her class. She wants to divide the class into teams of the same size, where each team has the same number of girls and the same number of boys. If Rachel creates the greatest number of teams possible, how many boys will be on each team?

• 35

• 25

• 12

• 7

CHALLENGE: In a factory, machine 1 checks every 3rd box. Machine 2 checks every 4th box. How many boxes will be double-checked by both machines within a 200 box span?

• 12

• 16

• 17

• 50