Factors of Numbers

What is a factor?

• a factor is when you divide two numbers to get another number
• a whole number that multiplies with another factor to get the whole number product
• a factor the answer to a multiplication problem
• the same as a multiple

A prime number

• has one factor
• has more than 2 factors
• has 100 factors
• has exactly 2 factors: 1 and the number

A composite number

• has more than 2 factors
• has one factor
• has at least 10 factors
• is always a really big number

Find ALL FACTORS of 24

• 1, 2, 12, 24

• 1, 2, 8, 24

• 1, 2, 3, 4, 5, 6, 8, 12, 24

• 1, 2, 3, 4, 6, 8, 12, 24

Which number is a factor of 10

• 3
• 4
• 5
• 8

Which number is a factor of 18

• 4
• 7
• 6
• 12

Which number is a factor of 42?

• 7
• 5
• 4
• 8

Which number is a factor of 23?

• 8
• 4
• 3
• 1

Which lists all the factors of 15?

• 1, 7, 8, 15
• 1, 15
• 1, 3, 5, 15
• 3, 5, 15

Is 10 a factor of 20?

• yes

• no