Least Common Multiple practice

Two neon signs are turned on at the same and begin to blink.  One sign links every 9 seconds.  The other blinks every 15 seconds.  In how many seconds will they blink together?

• 3
• 5
• 45
• 9

Tags

CCSS.6.NS.B.4

The school cafeteria serves tacos every sixth day and cheeseburgers every eighth day.  If tacos and cheeseburgers are both on today's menu, in how many days will they both be on the menu again?

• 24
• 2
• 6
• 12

Tags

CCSS.6.NS.B.4

Two clocks are turned on at the same time.  One chimes every 15 minutes.  The other chimes every 25 minutes.  In how many minutes will they chime together?

• 5
• 75
• 15
• 25

Tags

CCSS.6.NS.B.4

A radio station is giving away a $100 bill to every 30th caller and movie tickets to every 40th caller.  Which caller will be the first to win both prizes?

• 5
• 2
• 10
• 120

Tags

CCSS.6.NS.B.4

Melanie and Martin are both building a toy train track out of connecting pieces. Melanie has pieces that are 8 inches long while Martin's pieces are 20 inches long.  How long will the shortest track be that they can each build with the same length?

• 2
• 40
• 4
• 20

Tags

CCSS.6.NS.B.4

Henry and Mark are traveling around a circular track.  Henry is riding his bike and takes 7 minutes to make one loop. Mark is walking and takes 12 minutes to make one loop.  If they start at the same time, in how many minutes will they meet each other again?

• 1
• 7
• 84
• 12

Tags

CCSS.6.NS.B.4

The least common multiple of 4 and 6 is

• 6

• 12

• 18

• 24

Tags

CCSS.6.NS.B.4

The least common multiple of 12 and 18 is

• 36

• 48

• 60

• 72

Tags

CCSS.6.NS.B.4

The least common multiple of 20 and 30 is

• 20

• 30

• 40

• 60

Tags

CCSS.6.NS.B.4

The least common multiple of 2 and 3 is

• 2

• 4

• 6

• 12

Tags

CCSS.6.NS.B.4