This gives us a complete list of all the factors of 72 as shown in the figure given above. Step 3: After the list is noted, we get all the factors of 72 starting from 1 up there, coming down and then we go up again up to 72.So, as we write 1 as the factor of 72, we get the other factor as 72 and as we write 2 as the factor of 72, we get 36 as the other factor. Here, (1, 72) forms the first pair, (2, 36) forms the second pair and the list goes on as shown. For example, starting from 1, we write 1 × 72 = 72, and 2 × 36 = 72 and so on. As we check and list all the numbers up to 9, we automatically get the other pair factor along with it. We write that particular number along with its pair and make a list as shown in the figure given above. Step 2: The numbers that completely divide 72 are known as its factors.We need to make a note of those numbers that divide 72 completely. So, we divide 72 by natural numbers starting from 1 and go on till 9. Step 1: In order to find the factors of 72 using multiplication, we need to check what pairs of numbers multiply to get 72.Let us find all the factors of 72 using multiplication with the help of the following steps. Let us find the factors of 72 using the multiplication method. The most commonly used method to find the factors of a number is using the multiplication method. How to Find the Factors of 72?įactorization of a number means writing the number as a product of its factors. For negative factors, we need to multiply a negative factor by a negative factor, like, (-36) × (-2) = 72. It means that 72 is completely divisible by all these numbers. This positive divisor is the number 1 itself.There are 12 factors of 72 that can be listed as 1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, and 72. 1 does not happen to be a prime number because it has only one positive divisor. This because 41 is a natural number whose formation cannot take place with the multiplication of two natural numbers that are smaller than it.Ī. 2 is the only even number that happens to be a prime number.Ī. Also, an even number can never be a prime number with the exception of number 2. Being an even number other than 2 means that it cannot be a prime number. Furthermore, the reason for this is that zero has more than 2 divisors. Zero does not happen to be a prime number. Can we say that zero is a prime number?Ī. This is because 11 is a number that has only two distinct divisors: 1 and 11. Of course, we can say that 11 is a prime number. Therefore units digit of every prime number (other than 2 and 5) must be necessarily 1, 3, 7 0r 9.Ī. All the even numbers are composite so prime numbers cannot end with any of the digits 0, 2, 4, 6, 8. Question 1: The units digit of every prime number (other than 2 and 5 ) must be necessarily In these way, we can identify if the number is a prime or composite number. Now, what about the number 1? The number 1 is neither prime nor a composite number.
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