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What is the divisibility rule for 5?
The number must end in 5 or 0.
What is the divisibility rule for 3?
Add the digits. If the sum is a number divisible by 3, 3 is a factor.
If 2 and 3 are factors of a number, so is...
6
Any even number has which factor?
2
Is the number 1 prime or composite?
neither
How do I know when a number is a factor of another?
You can divide the number by it with no remainder
What are the factors of 81?
1, 3, 9, 27, 81
What are the factors of 21?
1, 3, 7, 21
What are the factors of 20?
1, 2, 4, 5, 10, 20
What are the factors of 18?
1, 2, 3, 6, 9, 18
What are the factors 16?
1, 2, 4, 8, 16
What are the factors of 12?
1, 2, 3, 4, 6, 12
What are the first five multiples of 7?
7, 14, 21, 28, 35
What are the first five multiples of 6?
6, 12, 18, 24, 30
A composite number has how many factors?
more than 2
A prime number has how many factors?
2
What are the factors of 1?
1
_______ x _______ = product
factor
What are the factors of 54?
1, 2, 3, 6, 9, 18, 27, 54
What are the factors of 36?
1, 2, 3, 4, 6, 9, 12, 18, and 36
What are the factors of 25?
1, 5, 25
What are the factors of 7?
1 and 7
What are the factors of 5?
1 and 5
What are the factors of 2?
1 and 2