Divisibility rules + Composite and Prime + GCF

Is 81 divisible by 3?

• yes

• no

What is the divisibility rule of 4?

• The last digit must form a number that is a multiple of 4.

• The last two digits must form a number that is a multiple of 4.

• The sum of digits is in the multiple of 4.

IS 816 divisible by 3?

• yes because 16 is in the multiple of 3.

• yes because 6 is in the multiple of 3.

• yes because its sum is in the multiple of 3.

which of the following is an even number?

• 13

• 26

• 59

What is the divisibility rule of 5?

• the ones digit must be 0 only.

• the ones digit must be 0 or 5.

• the ones digit must be 5 only.

A number is divisible by 10 if

• It ends with 0.

• It ends with 10.

• It ends with 3.

All these numbers are divisible by 5 except

• 25

• 36

• 40

The GCF of 2 and 4 is

• 4

• 2

• 8

The GCF of 20 and 16 is

• 20

• 16

• 5

• 4

The GCF of 36 and 27 is

• 8

• 9

• 4