Factors
Which of the following are FACTORS of the number 16?
A) 2
B) 4
C) 12
D) 8
A) 2 (2 x 8 = 16)
B) 4 (4 x 4 = 16)
D) 8 (8 x 2 = 16)
Which of the following are MULTIPLES of 4?
A) 2
B) 12
C) 21
D) 16
B) 12
D) 16
4, 8, 12, 16, 20
Is the number 9, PRIME or COMPOSITE?
Composite
1 x 9
3 x 3
I am a number less than 40. One of my factors is 7. The sum of my digits is 8. What number am I?
*Hint: List out the factors of 7 to see what fits!*
35
List the first 4 multiples of 8.
8, 16, 24, 32
Which of the following are FACTORS of 24?
A) 8
B) 14
C) 5
D) 6
A) 8 (8 x 3=24)
D) 6 (6 x 4=24)
Which of the following are MULTIPLES of 7?
A) 1
B) 16
C) 21
D) 63
B) 16
D) 63
7, 14, 21, 28, 35, 42, 49, 56, 63, 70
Is the number 17, PRIME or COMPOSITE?
Prime
1 x 17
I am a number less than 100. Two of my factors are 3 and 5. My digits are 1 apart. What number am I?
*Hint: Find the common multiples of 3 and 5 - which one that fits this clue*
45
List all of the factors of 24.
1, 2, 3, 4, 6, 8, 12, 24
1 x 24 = 24
2 x 12 = 24
3 x 8 = 24
4 x 6 = 24
Which of the following ARE NOT factors of 26?
A) 13
B) 8
C) 2
D) 6
B) 8
D) 6
13 x 2 = 26
Which of the following are MULTIPLES of 8?
A) 4
B) 24
C) 48
D) 90
C) 48
8, 16, 24, 32, 40, 48, 56, 64, 72, 80, 88, 96
Is the number 35, PRIME or COMPOSITE?
Composite
1 x 35
5 x 7
I am a number less than 60. Two of my factors are 2 and 7. I am a multiple of 8 and 6. What number am I?
*Hint - what are you multiples of 8 and 6? Do they share any? Of the ones that they share, which have factors of 2 and 7?
56
List the first 6 multiples of 6.
6, 12, 18, 24, 30, 36
Which of the following are FACTORS of 48?
A) 4
B) 6
C) 12
D) 8
4 x 12 = 48
6 x 8 = 48
Which of the following are MULTIPLES of 6?
A) 3
B) 61
C) 24
D) 42
C) 24
D) 42
6, 12, 18, 24, 30, 36, 42, 48, 54, 60
Is the number 41, PRIME or COMPOSITE?
Prime
1 x 41
I am a common multiple of 2 and 5. I am also a factor of 100. The sum of my digits is 5. What number am I?
*Hint - list out your multiples of 2 and 5. Do they share any that fit this clue?
50
What is the least common multiple of 4 and 6?
Multiples of 4: 4, 8, 12, 16, 20, 24, 28, 32, 36, 40
Multiples of 6: 6, 12, 18, 24, 30, 36, 42, 48, 54, 60
Common multiples = 12, 24, 36
LEAST COMMON MULTIPLE = 12
Which of the following lists ALL of the factors of 50?
A) 1, 2, 5, 50
B) 1, 2, 5, 10, 25, 50
C) 2, 5, 10, 25
D) 1, 2, 5, 10, 25
B) 1, 2, 5, 10, 25, 50
1 x 50 = 50
2 x 25 = 50
5 x 10 = 50
Which of the following are MULTIPLES of 9?
A) 36
B) 81
C) 72
D) 54
All of them are multiples of 9
9, 18, 27, 36, 45, 54, 63, 72, 81, 90
Is the number 59, PRIME or COMPOSITE?
Composite
1 x 59
I am a number less than 50. One of my factors is 6. When you add my digits together, they equal one of my multiples. What number am I?
*Hint - list the multiples of 6 that are less than 50. List the factors of all the multiples you listed. Which MULTIPLE has a factor that is the equivalent of the two numbers added together?
48
Factors of 24: 1, 2, 3, 4, 6, 8, 12, 24
Factors of 36: 1, 2, 3, 4, 6, 8, 12, 18, 36
Common Factors: 1, 2, 3, 4, 6, 8, 12
GREATEST COMMON FACTOR: 12