Skill Practice - GCF and LCM

In New York City, taxi cabs make a loop around the block every 9 minutes and buses make the loop every 15 minutes.  If they leave a stop at the same time, when will they both be back at the stop again? 

• 3 minutes
• 45 minutes
• 65 minutes
• 30 minutes

Tags

CCSS.6.NS.B.4

Stacy is making flower baskets for her neighbors.  She has 18 roses, 12 daisies and 24 sunflowers.  She wants to put the same number of each flower in each basket.  What is the greatest number of baskets she can make? 

• 48 baskets
• 36 baskets
• 2 baskets
• 6 baskets

Tags

CCSS.6.NS.B.4

Jenny goes to dance class every 6 days and karate class every 9 days.  If she did both today, in how many days will she do both again? 

• 18 days
• 24 days
• 36 days
• 54 days

Tags

CCSS.6.NS.B.4

Which of the following is a multiple of 8?

• 8
• 2
• 4
• 100

Tags

CCSS.6.NS.B.4

Kevin solved a problem by making these lists:
12: 24, 36, 48, 60
15: 30, 45, 60
Was Kevin trying to find the GCF or LCM of 12 and 15?

• GCF
• LCM

Tags

CCSS.6.NS.B.4

James says that 12 is a common factor of 3 and 4. June says that 12 is a common multiple of 3 and 4. Who is correct?

• James
• June

Tags

CCSS.6.NS.B.4

Two clocks are turned on at the same time.  One clock chimes every 15 minutes.  The other chimes every 20 minutes.  In how many minutes will they chime together? 

• 55 mintues
• 60 minutes
• 40 minutes
• 75 minutes

Tags

CCSS.6.NS.B.4

Pencils come in packages of 10. Erasers come in packages of 12. Phillip wants to purchase the smallest number of pencils and erasers so that he will have exactly 1 eraser per pencil. How many packages of pencils and erasers should Phillip buy?

• 4 packages of pencils and 3 packages of erasers

• 5 packages of pencils and 4 packages of erasers

• 6 packages of pencils and 5 packages of erasers

• 12 packages of pencils and 10 packages of erasers

Kiara baked 30 oatmeal cookies and 48 chocolate chip cookies to package in plastic containers for her friends at school. She wants to divide the cookies into identical containers so that each container has the same number of each kind of cookie. If she wants each container to have the greatest number of cookies possible, how many plastic containers does she need?

• 240

• 120

• 6

• 2

At a display booth at an amusement park, every visitor gets a gift bag. Some of the bags have items in them as shown in the table below.

Items in the Gift Bags

Hat ~ Every 2nd visitor

T-shirt ~ Every 7th visitor

Backpack ~ Every 10th visitor

How often will a bag contain all three items?

• Every 14 bags

• Every 20 bags

• Every 70 bags

• Every 140 bags