Topic 7 Review

Front

What is the divisibility rule for 3?

Back

If the number's digits add up to a multiple of 3, then 3 is a factor. Example: 75 --- 7+5 is 12, 12 is a multiple of 3, so 3 is a factor of 75.

Front

What is a prime number?

Back

A prime number is a number that has exactly two factors: 1 and itself. Example: 3 is prime because its only factors are 1 and 3.

Front

What is a composite number?

Back

A composite number is a number that has more than two factors. Example: 4 is composite because its factors are 1, 2, and 4.

Front

What is the greatest common factor (GCF)?

Back

The GCF of two or more numbers is the largest number that divides all of them without leaving a remainder. Example: The GCF of 24 and 36 is 12.

Front

What is the divisibility rule for 10?

Back

If the number ends in 0, then it has 10 as a factor.

Front

What is the definition of a factor?

Back

A factor is a number that divides another number without leaving a remainder. Example: 2 is a factor of 8.

Front

What is the definition of a multiple?

Back

A multiple is the result of multiplying a number by an integer. Example: 12 is a multiple of 3 (3 x 4 = 12).

Front

What is the number 1 classified as?

Back

1 is special because it only has one factor (itself) and is neither prime nor composite.

Front

What is the divisibility rule for 2?

Back

If a number ends in 0, 2, 4, 6, or 8, then it is divisible by 2.

Front

What is the definition of an even number?

Back

An even number is any integer that is divisible by 2. Example: 4 is even because 4 ÷ 2 = 2.