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Prime or Composite
Factorize
GCF
LCM
Divisibility
100

For each number identify which number is Prime and which is composite.

22 and 5

22 is composite

5 is prime

100

Draw a factor tree of the following number and list the prime factorization:

16

2x2x2x2

100

Find the greatest common factor for:

16 and 24

GCF is 6

100

Find the LCM of 4 and 6

LCM is 12

100

Is 246 divisible by 2?

Last digit = 6 (even)

Yes

200

For each number identify which number is Prime and which is composite.

11, 21, 23, 7

Composite: 21

Prime: 11, 23, 7

200

Draw a factor tree of the following number:

36

2x3x2x3

200

Find the greatest common factor for:

45 and 60

GCF = 15

200

Find the LCM of 8 and 12

24

200

Is 123 divisible by 3?

Sum = 1+2+3 = 6 (divisible by 3) 

 Yes

300

For each number identify which number is Prime and which is composite.

63, 25,47, 45

Composite: 63, 25, 45

Prime: 47

300

Draw a factor tree of the following number:

60

2x3x5x2

300

Find the greatest common factor for:

50 and 75

GCF is 25

300

Find the LCM of 14 and 20

LCM is 140

300

Is 120 divisible by 2, 3, 4, 5, 6, 9, and 10


9 → No (sum = 3, not divisible by 9)


400

For each number identify which number is Prime and which is composite.

100, 101, 102, 103, 104, 105

Composite:100, 102,104,105

Prime:101, 103

400

Draw a factor tree of the following number:56

2x7x2x2

400

Find the greatest common factor for:

12, 18, 24

GCF is 6

400

Find the LCM of 3, 4, and 6

LCM = 12

400

Is 90 divisible by 2, 3, 4, 5, 6, 9, and 10?

All but...

4 → No (last two digits 90 ÷ 4 = not whole)

500

For each number identify which number is Prime and which is composite.

2, 3,23, 29, 31, 37 and 40

Prime: 2, 3,23, 29, 31, 37

Composite:2, 3,23, 29, 31, 37

500

Draw a factor tree of the following number:

72

4x2x3x3

500

Find the greatest common factor for:

27, 36, 45

GCF is 9

500

Find the LCM of 7, 9, and 21

  • Multiples:
    • 7 → 7, 14, 21, 28, 35, 42, 49, 56, 63…
    • 9 → 9, 18, 27, 36, 45, 54, 63…
    • 21 → 21, 42, 63…
  • LCM = 63
500

Is 3,240 divisible by 2, 3, 4, 5, 6, 9, and 10?

2 → Yes. 3 → Yes (sum = 9). 4 → Yes (last two digits 40 ÷ 4 = 10) 5 → Yes6 → Yes. 9 → Yes. 10 → Yes