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

List all of the factors of 24.

Back

1, 2, 3, 4, 6, 8, 12, 24.

Front

What does it mean for a number to be prime?

Back

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

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 divisibility rule for even numbers?

Back

All even numbers (numbers ending in 0, 2, 4, 6, 8) have 2 as a factor.

Front

What is a factor?

Back

A factor is a number that divides another number without leaving a remainder. Example: 2 is a factor of 8 because 8 ÷ 2 = 4.

Front

What is a composite number?

Back

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

Front

What is the smallest prime number?

Back

The smallest prime number is 2.

Front

What is the largest factor of any number?

Back

The largest factor of any number is the number itself.

Front

How do you determine if a number is even?

Back

A number is even if it ends in 0, 2, 4, 6, or 8.