Question

what am i?
a prime number is only divisible by the number 1 and itself.
a composite number is divisible by more than 1 and itself.
the number 2 has only two factors, which are 1 and 2 (itself).
it is only divisible by these factors. therefore, 2 is a prime number.
the number 4 has 1, 2, and 4 as factors so it is divisible by
more than 1 and itself. therefore, 4 is a composite number.
look at each number. write p if it is a prime number or c if it is a composite number.
circle the even numbers.
9
22
5
17
51
42
73
13

49
14
19
29
32
81
25
39

64
78
91
54
94
45
27
83

12
89
68
103
34
47
109
122

74
33
58
44
87
94
40
52

61
115
107
67
51
43
58
105

93
83
72
38
25
15
88
34

20
identifying prime and composite numbers

Explanation:

Step1: Define prime/composite rules

Prime: only divisible by 1 & itself. Composite: divisible by more than 1 & itself. Even numbers (except 2) are composite.

Step2: Classify each number row 1

• 9: divisible by 3 → C
• 22: even (≠2) → C
• 5: only 1,5 → P
• 17: only 1,17 → P
• 51: divisible by 3 → C
• 42: even (≠2) → C
• 73: only 1,73 → P
• 13: only 1,13 → P

Step3: Classify each number row 2

• 49: divisible by 7 → C
• 14: even (≠2) → C
• 19: only 1,19 → P
• 29: only 1,29 → P
• 32: even (≠2) → C
• 81: divisible by 9 → C
• 25: divisible by 5 → C
• 39: divisible by 3 → C

Step4: Classify each number row 3

• 64: even (≠2) → C
• 78: even (≠2) → C
• 91: divisible by 7 → C
• 54: even (≠2) → C
• 94: even (≠2) → C
• 45: divisible by 5 → C
• 27: divisible by 3 → C
• 83: only 1,83 → P

Step5: Classify each number row 4

• 12: even (≠2) → C
• 89: only 1,89 → P
• 68: even (≠2) → C
• 103: only 1,103 → P
• 34: even (≠2) → C
• 47: only 1,47 → P
• 109: only 1,109 → P
• 122: even (≠2) → C

Step6: Classify each number row 5

• 74: even (≠2) → C
• 33: divisible by 3 → C
• 58: even (≠2) → C
• 44: even (≠2) → C
• 87: divisible by 3 → C
• 94: even (≠2) → C
• 40: even (≠2) → C
• 52: even (≠2) → C

Step7: Classify each number row 6

• 61: only 1,61 → P
• 115: divisible by 5 → C
• 107: only 1,107 → P
• 67: only 1,67 → P
• 51: divisible by 3 → C
• 43: only 1,43 → P
• 58: even (≠2) → C
• 105: divisible by 5 → C

Step8: Classify each number row 7

• 93: divisible by 3 → C
• 83: only 1,83 → P
• 72: even (≠2) → C
• 38: even (≠2) → C
• 25: divisible by 5 → C
• 15: divisible by 3 → C
• 88: even (≠2) → C
• 34: even (≠2) → C

Step9: Circle even numbers

Even numbers to circle: 22, 42, 14, 32, 64, 78, 54, 94, 12, 68, 34, 122, 74, 58, 44, 94, 40, 52, 58, 72, 38, 88, 34

Answer:

Row 1:

9: C, 22: C (circled), 5: P, 17: P, 51: C, 42: C (circled), 73: P, 13: P

Row 2:

49: C, 14: C (circled), 19: P, 29: P, 32: C (circled), 81: C, 25: C, 39: C

Row 3:

64: C (circled), 78: C (circled), 91: C, 54: C (circled), 94: C (circled), 45: C, 27: C, 83: P

Row 4:

12: C (circled), 89: P, 68: C (circled), 103: P, 34: C (circled), 47: P, 109: P, 122: C (circled)

Row 5:

74: C (circled), 33: C, 58: C (circled), 44: C (circled), 87: C, 94: C (circled), 40: C (circled), 52: C (circled)

Row 6:

61: P, 115: C, 107: P, 67: P, 51: C, 43: P, 58: C (circled), 105: C

Row 7:

93: C, 83: P, 72: C (circled), 38: C (circled), 25: C, 15: C, 88: C (circled), 34: C (circled)