Factors
Multiples
Common Multiples
Common Factors
Primes (hard)
100

The factors of 6

What is 1,2,3,6

100
0, 24, 48, 72, 96, 120...
What are the multiples of 24?
100

The least common multiple of 8 and 9 

What is 72

100
The greatest common factor of 6 and 24
What is 6?
100

The first ten prime numbers

2, 3, 5, 7, 11, 13, 17, 19, 23, 29

200

The factors of 15

What is 1, 3, 5, 15

200

The first five multiples of 13

13, 26, 39, 52, 65

200

The least common multiple of 6 and 7

What is 42

200

The greatest common factor of 25 and 48

What is 1?

200

Ten prime numbers bigger than 10

11, 13, 17, 19, 23, 29, 31, 37, 41, 43

300

The factors of 36

What is 1, 2, 3, 4, 6, 9, 12, 18, 36

300

The first 13 multiples of 7

7, 14, 21, 28, 35, 42, 49, 56, 63, 70, 77, 84, 91

300

The least common multiple of 8 and 24

What is 24?

300

The greatest common factor of 9 and 27

What is 9?

300

Write 48 as a string of multiplications of prime numbers. For example, 12 is 3x2x2 and 21 is 7x3.

2x2x2x2x3

400

Factors of 48

1, 2, 3, 4, 6, 8, 12, 16, 24, 48

400

True or False: When you multiply two prime numbers, the answer is prime.

False

400

33 is the LCM of these two prime numbers

What are 3 and 11?

400

The greatest common factor of 12 and 60

What is 6?

400

Write 72 as a string of multiplications of prime numbers. For example, 12 is 3x2x2 and 21 is 7x3.

3x3x2x2x2

500

The factors of 144

1, 2, 3, 4, 6, 8, 9, 12, 16, 18, 24, 36, 48, 72, 144

500
36, 45, 72, 108 are multiples of this number
What is 9?
500
The LCM of 11 and this number is 132
What is 12?
500

The greatest common factor of 132 and 22

What is 11?

500

Write 1320 as a string of multiplications of prime numbers. For example, 12 is 3x2x2 and 21 is 7x3.

11x5x3x2x2x2