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Factors of 99

Last updated date: 17th Apr 2024
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What are the Factors of 99?

Factors of 99 are the integers or the natural numbers that can be evenly/completely divided into 99; they can be represented as either individual factors or as factor pairs. In this scenario, we present them both ways. This is a mathematical decomposition of a specific number. While generally a positive integer, if any factor divides the number 99, then there is no remainder left while the quotient is a whole number. Let’s take an example of 8, whose factors are 1, 2, 4, and 8. Therefore, if you divide 8 by 4 you get 2 as a the result.

8 ÷ 4 = 2

So, there is no remainder left and a quotient is a whole number.

How to Find Factors of 99?

We can find the factors of 99 with pair factors and prime factors. The pair factors are an outcome of the original number, when multiplied together and prime factors are actually the prime numbers that divide the original number, evenly.

Finding Factors of 99

Factors of 99 are the integers or real numbers which divide the original number, evenly, without leaving any remainder and a quotient is a whole number. 99 is a composite number, thus, it will consist of more than two factors. We will begin by dividing 99 by the smallest natural number 1.

Original Number


99 ÷ 1


99 ÷ 3


99 ÷ 9


99 ÷ 11


99 ÷ 33


99 ÷ 99


Therefore, the factors of 99 are 1, 3, 9, 11, 33, and 99.

How many factors does 99 have?

Number 99 consists of 6 factors: 1, 3, 9, 11, 33, 99

More particularly, shown as pairs...

(1 x 99) (3 x 33) (9 x 11) (11 x 9) (33 x 3) (99 x 1)

Prime Factorization of 99

A prime factorisation is an outcome of factoring a number into a set of elements in which every member is a prime number. This is usually expressed by representing 99 as a product of its prime factors. For 99, this outcome would be:

99 = 3 x 3 x 11

(This is also called prime factorisation; the smallest prime number in this series is defined as the smallest prime factor)

Finding the factors of negative numbers? (-99)

In order to find the factors of -99, determine all the positive factors and then duplicate them by adding a minus sign before them (optimally multiplying them by -1). This caters to negative factors.

Is 99 a Prime Number?

No, 99 is not a prime number. All positive divisors (i.e., the list of all integers that divide 99) are as given: 1, 3, 9, 11, 33, 99. For 99 to be a prime number, it would have been needed that 99 consists of only two divisors, i.e., itself and 1.

Pair Factors of 99

The product of pair factors of 99, will be consequent in the original number, such that;

1 × 99 = 99

3 × 33 = 99

9 × 11 = 99

So, the pair factors are (1, 99), (3, 33), and (9, 11).

As we can observe, the above-mentioned were the positive pair factors. In the same manner, if we take into account negative pairs of factors, the multiplication of such two negative numbers will lead to the original number.

-1 × -99 = 99

-3 × -33 = 99

-9 × -11 = 99

Thus, the negative pair factors are as follows: (-1, -99), (-3, -33), and (-9, -11).

Divisibility Rules of Factorization

Divisibility is described as a given integer number being divisible for a given divisor. The divisibility rule is a shorthand approach to identifying what is or isn't divisible. This involves rules about even number and odd number factors. This example is deliberated to enable the student to estimate the status of a given number in absence of computation.

Solved Examples on Factors of 99


99 players have to go in a tournament. There are 11 seats available on the bus. How many players can be seated in one seat?



Number of players = 99

Number of seats in a bus = 11

Number of players sitting in a seat = 99/11 = 9


What are the common factors of 11 and 99?


Let’s express the factors of both the numbers.

11 → 1, 11 (Because 11 is a prime number)

99 → 1, 3, 9, 11, 33 and 99 (99 is a composite number)

Thus, we can notice the common factors are 1 and 11.


In real life, factoring is a valuable skill. Common uses include splitting something into equal parts, exchanging money, comparing costs, comprehending time, and doing computations while travelling. Understanding factoring enables you to traverse number relationships in the real world without relying on your calculator or phone.

FAQs on Factors of 99

1. What is the Greatest Common Factor of 99?

The greatest common factor (GCF) of two numbers can be identified by comparing the prime factorization of the two numbers and taking the highest common prime factor. If there is no common factor, the greatest common factor is 1. This is also termed as the highest common factor (HCF) and is an element of the common prime factors of two numbers. It is the highest factor (largest number) the two numbers share as a prime factor. The least common factor (LCF) (smallest number in common) of any pair of integers is 1.

2. Is 99 a Composite Number?

Yes, 99 is a composite number. It is the product of two positive numbers except 1 and itself.

3. What is a Factor Tree?

A factor tree is a graphical representation of the possible factors of a number in addition to their sub-factors. It is mainly formulated to simplify factorization. It is designed by determining the factors of a number, then finding the factors of the factors of a number. The process carries on recursively until we've derived a bunch of prime factors, that is the prime factorization of the original number. In building the tree, make sure to remember the second item in a factor pair.