Prime & Composite Numbers
Prime Factorization
Greatest Common Factor
Least Common Multiple
Brain Busters
100

Is 23 prime or composite?

Prime

100

What is the prime factorization of 42? 

2 x 3 x 7 

100

Find the GCF for 45 & 60. 

GCF is 15. 

100

True or False: When finding the Least Common Multiple, if at least one of the numbers is prime, you can just multiply them together. 

True. 

100

0.934 + 1.67 

2.604

200

Is 184 prime or composite? 

Composite

200

What is the prime factorization of 29? 

29 is prime. 

200

Find the GCF for 14 & 28. 

GCF is 14. 

200

Find the LCM of 4 and 8. 

LCM is 8. 

200

14.54 - 2.5

12.04

300

When is a number considered to be prime? 

A number is considered to be prime when its only factors are 1 and itself. 
300

What is the prime factorization of 56? 

2 x 2 x 2 x 7 or 23 x 7

300

Find the GCF of 55 and 99. 

GCF is 11. 

300

Find the LCM of 8 and 12. 

LCM is 24. 

300

2.67 x 6.3

16.821

400

When is a number considered composite? 

A number is considered composite when it has more than 2 factors. 

400

What is the prime factorization of 99?

3 x 3 x 11 or 32 x 11

400

Find the GCF of 83 and 91. 

GCF is 1. 

400

Find the LCM of 4 and 9. 

LCM is 36. 
400

2.87 ÷ 4.1

0.7

500

True or false: All odd numbers are prime. 

False. 

500

What is the prime factorization of 97?

97 is prime. 
500

Find the GCF of 12 and 18. 

GCF is 6. 

500

Find the LCM of 6 and 7. 

LCM is 42. 

500

62.3 x 5.8

361.34

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