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# What Are The Prime Factors Of 90

What are the prime factors of 90? Answer: 2, 3, 5

The number 90 has 3 prime factors. Primes can only have two factors(1 and itself) and only be divisible by those two factors. Any figure where this rule applies can be called a prime factor. The biggest prime factor of 90 is 5. The smallest prime factor of 90 is 2.

## What Is The Factor Tree Of 90

How to use a factor tree to find the prime factors of 90? A factor tree is a diagram that organizes the factoring process.

• First step is to find two numbers that when multiplied together equal the number we start with.
90
↙ ↘
2 × 45
• Second step is to check the multiplication(of the first step) for numbers that are not primes.
45
↙ ↘
3 × 15
• Third step is to check the multiplication(of the second step) for numbers that are not primes.
15
↙ ↘
5 × 3

We found 3 prime factors(2, 3, 5) using the factor tree of 90. Now let us explain the process to solving factor trees in more detail. Our goal is to find all prime factors of a given whole number. In each step of our factor tree diagram for 90 we always checked both multiplication numbers if they were primes or not. If one or both of the integers are not prime numbers then this means that we will have to make diagrams for them too. This process continues until only prime numbers are left.

Remember that often a factor tree for the same integer can be solved in more than one correct way! An example of this is the figure 12 where 2*6=12 and 4*3=12. The primes of a factor tree for 12 are the same regardles if we start the factor tree with 2*6 or 4*3.

## How To Verify If Prime Factors Of 90 Are Correct Answers

To know if we got the correct prime factors of 90 we have to get the prime factorization of 90 which is 2 * 3 * 3 * 5. Because when you multiply the primes of the prime factorization the answer has to be equal with 90.

After having checked the prime factorization we can now safely say that we got all prime factors.

## General Mathematical Properties Of Number 90

90 is a composite number. 90 is a composite number, because it has more divisors than 1 and itself. This is an even number. 90 is an even number, because it can be divided by 2 without leaving a comma spot. This also means that 90 is not an odd number. When we simplify Sin 90 degrees we get the value of sin(90)=0.89399666360056. Simplify Cos 90 degrees. The value of cos(90)=-0.44807361612917. Simplify Tan 90 degrees. Value of tan(90)=-1.9952004122082. When converting 90 in binary you get 1011010. Converting decimal 90 in hexadecimal is 5a. The square root of 90=9.4868329805051. The cube root of 90=4.4814047465572. Square root of √90 simplified is 3√10. All radicals are now simplified and in their simplest form. Cube root of ∛90 simplified is 90. The simplified radicand no longer has any more cubed factors.

## Determine Prime Factors Of Numbers Smaller Than 90

Learn how to calculate primes of smaller numbers like:

## Determine Prime Factors Of Numbers Bigger Than 90

Learn how to calculate primes of bigger numbers such as:

## Single Digit Properties For Number 90 Explained

• Integer 9 properties: 9 is odd and the square of 3. It is a composite, with the following divisors:1, 3, 9. Since the quantity of the divisors(excluding itself) is 4<9, it is a defective number. In mathematics nine is a perfect total, suitable and a Kaprekar figure. Any amount is divisible by 9 if and only if the quantity of its digits is. Being divisible by the count of its divisors, it is refactorizable. Each natural is the sum of at most 9 cubes. If any sum of the digits that compose it is subtracted from any natural, a multiple of 9 is obtained. The first odd square and the last single-digit quantity. In the binary system it is a palindrome. Part of the Pythagorean triples (9, 12, 15), (9, 40, 41). A repeated number in the positional numbering system based on 8. Nine is a Colombian digit in the numerical decimal system. If multiplied 9 always leads back to itself: 2×9=18 → 1+8=9, 3×9=27 → 2+7=9 in the same way if you add a number to 9, the result then refers to the initial digit: 7+9=16 → 1+6=7, 7+9+9=25 → 2+5=7, 7+9+9+9=34 → 3+4=7. If you put 111111111 in the square (ie 1 repeated 9 times) you get the palindrome 12345678987654321, also if you add all the numbers obtained: 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 8 + 7 + 6 + 5 + 4 + 3 + 2 + 1 you get 81, and in turn 8 + 1 = 9.
• Integer 0 properties: 0 is the only real figure that is neither positive nor negative. Sometimes it is included in natural numbers where it can be considered the only natural in addition to the one to be neither first nor composed, as well as the minimum of natural numbers(that is, no natural digit precedes the 0). In an oriented line (which makes a point on the straight line correspond to each real number, preserving also the relation of order), the 0 coincides conventionally with the origin. Since it can be written in the form 2k, with con k integer, 0 is called even. It is both a figure and a numeral. In set theory, the zero is the cardinality of the empty set. In fact, in certain axiomatic mathematical developments derived from set theories, zero is defined as the empty set. In geometry, the size of a point is 0. Zero is the identity element of an additive group or additive identity in a ring.

## Finding All Prime Factors Of A Number

We found that 90 has 3 primes. The prime factors of 90 are 2, 3, 5. We arrived to this answer by using the factor tree. However we could have also used upside down division to get the factorization primes. There are more that one method to factorize a integer.

## List of divisibility rules for finding prime factors faster

Rule 1: If the last digit of a figure is 0, 2, 4, 6 or 8 then it is an even number. All even numbers are divisible by 2.

Rule 2: If the sum of digits of a integer is divisible by 3 then the figure is also divisible by 3 and 3 is a prime factor(example: the digits of 12 are 1 and 2 so 1+2=3 and 3 is divisible by 3, meaning that 12 is divisible by 3). The same logic also works for 9.

Rule 3: If the last two digits of a number are 00 then this integer is divisible by 4(example: we know that 124=100+24 and 100 has two zeros in the end making it divisible with 4. We also know that 4 is divisible with 24). In order to use this rule to it's fullest it is best to know multiples of 4.

Rule 4: If the last digit of a number is 0 or 5 then 5 it is divisible by 5.

Rule 5: All integers that are divisible by both 2 and 3 are also divisible by 6. This is logical because 2*3=6.

## What Are Prime Factors Of A Number?

All numbers that are only divisible by one and itself are called prime factors in mathematics. A prime factor is a figure that has only two factors(one and itself).