## Divisibility Rules:

Divisibility Rules Rap (lyrics):

Divisibility rules help me construct

Hints about which factors multiply to make a product

More than one set of factors means composite

And only one set means prime is what we call it!

If it’s a whole number, guess what, you’re done! Every single number is divisible by one.

If the number’s even, then this rule’s true: It is, for sure, divisible by two.

For three add the digits, then look to see… if the answer’s gonna be a multiple of three.

To know if five… can be a factor, look to see if five or zero comes after.

If you can divide by both a two and three, then you can have six, too…. for free!

Add the digits again… and look that’s fine, to see if the number is divisible by nine.

Finally… the easiest comes last…

if zero’s at the end, then DIVIDE BY TEN!

Divisibility rules help me construct

Hints about which factors multiply to make a product

More than one set of factors means composite

And only one set means prime is what we call it!

Divisibility is a number's ability to be divided by another number without having a remainder. Students think: "Divisibility means able to divide by." We use the divisibility rules to list factors for numbers as well. Here are the rules for the numbers we study in fourth grade:

1: All numbers are divisible by one.

2: A number is divisible by two if the number is even. Then students should half the given number to find out what times two would equal the given number.

3: A number is divisible by three if, when you add the digits of the number together, the sum is a multiple of three.

Example: 90 (9 + 0 = 9 and 9 is a multiple of 3)

5: A number is divisible by 5 if the number ends in a five or a zero.

6: First, is it divisible by three? If it is, is the number that you multiply by three to get the number even? If so, double the three to make six and half the other number to get the other factor.

Example: 36: 3 x 12 so double 3 to make 6 and half 12 to make 6 and therefore 6 x 6 will give you 36.

9: A number is divisible by nine if, when you add the digits of the number together, the sum is a multiple of 9.

Example: 72 (7 + 2 = 9 and 9 is a multiple of nine)

10: A number is divisible by ten if the number ends in a zero.

Divisibility rules help me construct

Hints about which factors multiply to make a product

More than one set of factors means composite

And only one set means prime is what we call it!

If it’s a whole number, guess what, you’re done! Every single number is divisible by one.

If the number’s even, then this rule’s true: It is, for sure, divisible by two.

For three add the digits, then look to see… if the answer’s gonna be a multiple of three.

To know if five… can be a factor, look to see if five or zero comes after.

If you can divide by both a two and three, then you can have six, too…. for free!

Add the digits again… and look that’s fine, to see if the number is divisible by nine.

Finally… the easiest comes last…

if zero’s at the end, then DIVIDE BY TEN!

Divisibility rules help me construct

Hints about which factors multiply to make a product

More than one set of factors means composite

And only one set means prime is what we call it!

Divisibility is a number's ability to be divided by another number without having a remainder. Students think: "Divisibility means able to divide by." We use the divisibility rules to list factors for numbers as well. Here are the rules for the numbers we study in fourth grade:

1: All numbers are divisible by one.

2: A number is divisible by two if the number is even. Then students should half the given number to find out what times two would equal the given number.

3: A number is divisible by three if, when you add the digits of the number together, the sum is a multiple of three.

Example: 90 (9 + 0 = 9 and 9 is a multiple of 3)

5: A number is divisible by 5 if the number ends in a five or a zero.

6: First, is it divisible by three? If it is, is the number that you multiply by three to get the number even? If so, double the three to make six and half the other number to get the other factor.

Example: 36: 3 x 12 so double 3 to make 6 and half 12 to make 6 and therefore 6 x 6 will give you 36.

9: A number is divisible by nine if, when you add the digits of the number together, the sum is a multiple of 9.

Example: 72 (7 + 2 = 9 and 9 is a multiple of nine)

10: A number is divisible by ten if the number ends in a zero.