Divisibility Rules

Front

What is a divisibility rule?

Back

A divisibility rule is a shortcut that helps determine if one number can be divided by another without performing the actual division.

Front

What is the divisibility rule for 2?

Back

A number is divisible by 2 if its last digit (ones place) is even (0, 2, 4, 6, or 8).

Front

Is 917,825,106 divisible by 2?

Back

True, because the last digit is 6, which is even.

Front

What is the divisibility rule for 3?

Back

A number is divisible by 3 if the sum of its digits is a multiple of 3.

Front

Is 343 divisible by 3?

Back

False, because the sum of the digits (3 + 4 + 3 = 10) is not a multiple of 3.

Front

What is the divisibility rule for 5?

Back

A number is divisible by 5 if its last digit is 0 or 5.

Front

Is 8,425 divisible by 5?

Back

True, because the last digit is 5.

Front

What is the divisibility rule for 10?

Back

A number is divisible by 10 if its last digit is 0.

Front

Is 12,505 divisible by 10?

Back

False, because the last digit is 5, not 0.

Front

What is the divisibility rule for 4?

Back

A number is divisible by 4 if the number formed by its last two digits is divisible by 4.