Math Worksheets

Archive for the ‘Composite Numbers’ Category

The second way of answering Is 15 a composite number? is to try to divide 15 by a series of smaller Prime numbers, using the how to identify whole numbers that are prime and composite method. 

Using the list of Prime numbers that are smaller than 15, do the following divisions. 

List of Prime numbers to 15 

• Divide 15 by 2 – is 15 divisible by 2? The answer is no.

That means 1, 3, 5 and 15 are factors of 15 making 15 a composite number, not a prime number. 

Is 15 a composite number? -Is an example of a math composite number problem that can be easily answered using the How to identify whole numbers that are prime or composite steps.

There are different ways to answer the question “Is 15 a composite number?” or any other Prime numbers and Composite numbers problems.

The first way to determine if 15 is a prime number of a composite number is to look at the prime number and composite number chart. The chart below show all Composite numbers from 1 to 100.

All composite number to 100

List of Composite numbers showing that 15 is a composite number.

List of Composite numbers from 20 to 30

There are 8 Composite numbers from 20 to 30: 21 22 24 25 26 27 28 30

List of Composite numbers from 30 to 40

There are 8 Composite numbers from 30 to 40: 32 33 34 35 36 38 39 40

List of Composite numbers from 40 to 50

There are 7 Composite numbers from 40 to 50: 42 44 45 46 48 49 50

List of Composite numbers from 50 to 60

There are 8 Composite numbers from 50 to 60: 51 52 54 55 56 57 58 60

List of Composite numbers from 60 to 70

There are 8 Composite numbers from 60 to 70: 62 63 64 65 66 68 69 70

List of Composite Numbers from 70 to 80

There are 7 composite numbers from 70 to 80: 72 74 75 76 77 78 80

List of Composite Numbers from 80 to 90

There are 8 composite numbers from 80 to 90: 81 82 84 85 86 87 88 90

List of Composite Numbers from 90 to 100

There are 8 composite numbers from 90 to 100: 91 92 93 94 95 96 98 99 100

For more List of Composite Numbers, move onto the next section.