Divisibility and Factors

Front

What are factors?

Back

Factors are numbers that can be multiplied together to get another number. For example, the factors of 12 are 1, 2, 3, 4, 6, and 12.

Front

What are the factors of 12?

Back

1, 2, 3, 4, 6, 12

Front

What does it mean for a number to be divisible by another number?

Back

A number is divisible by another number if you can divide it without leaving a remainder.

Front

Which of the following numbers has 3 as a factor? 9, 11, 21

Back

9 and 21

Front

How can you check if a number is divisible by 3?

Back

Add the digits of the number together. If the sum is divisible by 3, then the original number is also divisible by 3.

Front

Which number is divisible by 9: 345, 8522, 98874?

Back

98874

Front

What is the rule for divisibility by 5?

Back

A number is divisible by 5 if it ends in 0 or 5.

Front

Is 48 divisible by 5?

Back

No

Front

What is the rule for divisibility by 4?

Back

A number is divisible by 4 if the last two digits form a number that is divisible by 4.

Front

Which of the following is NOT divisible by 4: 1,000, 5,740, 1,566, 2,024?

Back

1,566