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Divisibility Tests
Factors
Multiples & Least Common Multiples
Types of Numbers (Prime, Composite, squared)
Greatest Common Factors
100
Is 23,456 divisible by 2?
Yes
100
What are the factors of 7?
1, 7
100
8, 16, 24, 32, 40, 48... These numbers are the multiples of...
8
100
What is the first prime number?
2
100

What is the greatest common factors of 9 and 27?

What is 9?

200
Which of these is 147 divisible by? 1 2 3 4 5 6
1 3
200
1, 2, 3, 5, 6, 10, 30 Are these ALL of the factors of 30?
No, we are missing 15
200
What is the Least Common Multiple of 6 and 9?
What is 18
200
How do I find square numbers?
Multiply any number by itself
200

What is the GCF of 12 and 45?

What is 3

300
Is 55,552 divisible by 5
No
300
These are the factors of which number? (They are not in order!) 12, 3, 4, 8, 6, 1, 24, 2
24
300
What is the Least Common Multiple of 24 and 30?
What is 120
300
Is 51 a prime or composite number? Why?
What is composite? It is divisible by 3, It has more than 2 factors.
300

What is the GCF of 15 and 25?

What is 5?

400
Is 360,021,004 divisible by 3?
No
400
List the factors of 32
1, 2, 4, 8, 16, 32
400
What number is the least common multiple of 16 and 30? Use prime factorization - bday cake method
What is 240?
400
List the first 7 primes!
2, 3, 5, 7, 11, 13, 17
400

What is the GCF of 32, 24, and 40?

What is 8

500
Is 345 divisible by 2, 3 and/or 5
Divisible by 3 and 5 only
500
List the factors of 40. Which of these are prime numbers?
1, 2, 4, 5, 8, 10, 20, 40 Only 2 and 5 are prime
500
What is the least common multiple of 8, 16 and 20?
What is 80
500
Is 31 prime or composite? Why
What is Prime? It has exactly two factors: 1 and itself
500

What is the GCF of 12, 35, and 15?

What is 1