LCM & GCF

1.

1 point

Find the LCM of 4 and 5.

5

20

2.5

1

2.

1 point

One sign lights up every 30 seconds. Another sign lights up every 45 seconds. If both signs have just lit up, how long will it be before both signs light up at the same time again?

1350 seconds

15 seconds

90 seconds

60 seconds

3.

1 point

Jennifer bought submarine sandwiches for a party. She bought a 32-inch, 20-inch, and 12-inch sandwich and cut them into equal-sized pieces. What is the length of the longest piece that can be cut?

12 inches

6 inches

64 inches

4 inches

4.

1 point

Julie is planting 27 red tulips, 45 yellow tulips, and 81 white tulips. She wants to put them in rows of the same number for each color without mixing colors. What is the greatest number of tulips she can plant in each row?

27

3

81

9

5.

1 point

Hamburger buns are sold in packages of 8. Hamburger patties are sold in packages of 12. What is the least number of packages of hamburger buns and hamburger patties you can buy to have an equal number of each?

4 packages of hamburger buns and 4 packages of hamburger patties

6 packages of hamburger buns and 4 packages of hamburger patties

2 packages of hamburger buns and 1 package of hamburger patties

3 packages of hamburger buns & 2 packages of hamburger patties

6.

1 point

Which number does not have 3 as a factor?

56

12

126

72

7.

1 point

Find the least common multiple of 6 and 8.

24

48

16

2

8.

1 point

Find the GCF of 12 and 48.

12

6

48

2

9.

1 point

Which pair of numbers has 12 as the greatest common factor?

3 and 4

12 and 36

24 and 48

6 and 2

10.

1 point

Which list contains all the factors of 24?

1, 2, 3, 4, 6, 8, 12, 24

12, 24, 48, 60, 84

24, 48, 96

2, 3, 8, 12

11.

1 point

Find the GCF of 18 and 49.

18

1

882

7

12.

1 point

Find the GCF of 18, 24, and 30.

6

60

18

9

13.

1 point

Find the greatest common factor of 40 and 50.

5

10

200

25

14.

1 point

Find the least common multiple of 2 and 12.

24

6

12

2

15.

1 point

Presidents are elected every four years. Senators are elected every six years. If a senator was elected in the presidential election year 2012, in what year will she campaign again during a presidential election year?

2013

2048

2024

2018

16.

1 point

Find the GCF of 20 and 24.

480

2

4

60

17.

1 point

Find the least common multiple of 6 and 9.

54

9

18

3

18.

1 point

Find the least common multiple of 8 and 32.

16

32

64

8

19.

1 point

Find the least common multiple of 8, 12, and 16.

16

48

2

4

20.

1 point

What is the LCM of 24 and 36?

864

72

36

12