GCF & LCM Jeopardy!

GCF

100

Find the GCF of 12 & 16

4

200

Find the GCF of 6 & 18

6

300

Find the GCF of 20 & 35

5

400

Find the GCF of 160 & 288

32

500

Find the GCF of 126 and 216.

18. 

LCM

100

Find the LCM of 6 & 9

3

200

Find the LCM of 18 & 12

36

300

Find the LCM of 9 & 12

36

400

Find the LCM of 60 & 75

300

500

Find the LCM of 55 and 45.

495

Listing Factors/Multiples

100

Are factors bigger than the number you begin with or smaller?

Smaller

200

Are multiples bigger than the number you begin with or smaller?

Bigger

300

List the factors of 18 and 6, then circle the GCF.

18:1,2,3, (6),9,18

6:1,2,3,(6)

400

How is LCM used when working with fractions?

LCM is used to find the least common denominator. 

500

How is GCF used when working with fractions?

You use the GCF to simplify

Word Problems

100

The kids in the school play are to stand in equal rows of 4th & 5th graders and 6th & 7th graders. There are 170 4th & 5th graders and 98 6th & 7th graders. What is the greatest number of students that can stand in each row? Do you need to find GCF or LCM?

GCF

200

June wears jeans every eight days and a NASA t-shirt every twelve days. She wore both yesterday. How many days will it be till she wears both on the same day again? Are you trying to find GCF of LCM?

LCM

300

The kids in the school play are to stand in equal rows of 4th & 5th graders and 6th & 7th graders. There are 170 4th & 5th graders and 98 6th & 7th graders. What is the greatest number of students that can stand in each row? Solve

What is 14?

400

June wears jeans every eight days and a NASA t-shirt every twelve days. She wore both yesterday. How many days will it be till she wears both on the same day again? Solve.

What is 23?

500

Two neon signs are turned on at the same time. Both signs blink as they are turned on. One sign blinks every 9 seconds. The other sign blinks every 15 seconds. How many seconds will it be before they blink again at the same time?

Every 45 seconds