# Factors of 891 in pair

Factors of 891 in pair are (1, 891) , (3, 297) , (9, 99) , (11, 81) and (27, 33)

#### How to find factors of a number in pair

 1.   Steps to find factors of 891 in pair 2.   What is factors of a number in pair? 3.   What are Factors? 4.   Frequently Asked Questions 5.   Examples of factors in pair

### Example: Find factors of 891 in pair

Factor Pair Pair Factorization
1 and 891 1 x 891 = 891
3 and 297 3 x 297 = 891
9 and 99 9 x 99 = 891
11 and 81 11 x 81 = 891
27 and 33 27 x 33 = 891

Since the product of two negative numbers gives a positive number, the product of the negative values of both the numbers in a pair factor will also give 891. They are called negative pair factors.

Hence, the negative pairs of 891 would be ( -1 , -891 ) .

#### Introduction to factor pairs

Factor pair in mathematics is defined as all factors of a given number which when written in pair and multiplied gives the original number. Every natural number is a product of atleast one factor pair. Eg- Factors of 891 are 1 , 3 , 9 , 11 , 27 , 33 , 81 , 99 , 297 , 891. So, factors of 891 in pair are (1,891), (3,297), (9,99), (11,81), (27,33).

#### How can we define factors?

In mathematics a factor is a number which divides into another without leaving any remainder. Or we can say, any two numbers that multiply to give a product are both factors of that product. It can be both positive or negative.

#### Properties of Factors

• Every number is a factor of zero (0), since 891 x 0 = 0.
• Every number other than 1 has at least two factors, namely the number itself and 1.
• Every factor of a number is an exact divisor of that number, example 1, 3, 9, 11, 27, 33, 81, 99, 297, 891 are exact divisors of 891.
• Factors of 891 are 1, 3, 9, 11, 27, 33, 81, 99, 297, 891. Each factor divides 891 without leaving a remainder.

#### Steps to find Factors of 891

• Step 1. Find all the numbers that would divide 891 without leaving any remainder. Starting with the number 1 upto 445 (half of 891). The number 1 and the number itself are always factors of the given number.
891 ÷ 1 : Remainder = 0
891 ÷ 3 : Remainder = 0
891 ÷ 9 : Remainder = 0
891 ÷ 11 : Remainder = 0
891 ÷ 27 : Remainder = 0
891 ÷ 33 : Remainder = 0
891 ÷ 81 : Remainder = 0
891 ÷ 99 : Remainder = 0
891 ÷ 297 : Remainder = 0
891 ÷ 891 : Remainder = 0

Hence, Factors of 891 are 1, 3, 9, 11, 27, 33, 81, 99, 297, and 891

• Is 891 a composite number?

Yes 891 is a composite number.

• Is 891 a perfect square?

No 891 is not a perfect square.

• Write all odd factors of 891?

The factors of 891 are 1, 3, 9, 11, 27, 33, 81, 99, 297, 891.
Odd factors of 891 are 1 , 3 , 9 , 11 , 27 , 33 , 81 , 99 , 297 , 891.

• What is the mean of all prime factors of 891?

Factors of 891 are 1 , 3 , 9 , 11 , 27 , 33 , 81 , 99 , 297 , 891. Prime factors of 891 are 3 , 3 , 3 , 3 , 11. Therefore mean of prime factors of 891 is (3 + 3 + 3 + 3 + 11) / 5 = 4.60.

• What do you mean by proper divisors?

A number x is said to be the proper divisor of y if it divides y completely, given that x is smaller than y.

#### Examples of Factors

Can you help Rubel in arranging 891 blocks in order to form a rectangle in all possible ways? For arranging 891 blocks in order to form a rectangle in all possible ways we need to find factors of 891 in pair.

Factors of 891 are 1, 3, 9, 11, 27, 33, 81, 99, 297, 891. So, factors of 891 in pair are (1,891), (3,297), (9,99), (11,81), (27,33).

Ariel has been asked to write all factor pairs of 891 but she is finding it difficult. Can you help her find out?

Factors of 891 are 1, 3, 9, 11, 27, 33, 81, 99, 297, 891. So, factors of 891 in pair are (1,891), (3,297), (9,99), (11,81), (27,33).

How many total number of factors of 891 in pair are possible?

Factors of 891 are 1, 3, 9, 11, 27, 33, 81, 99, 297, 891. Hence, the factors of 891 in pair are (1,891), (3,297), (9,99), (11,81), (27,33). Therefore, in total 5 pairs of factors are possible.

Sammy wants to write all the negative factors of 891 in pair, but don't know how to start. Help Sammy in writing all the factor pairs.

Negative factors of 891 are -1, -3, -9, -11, -27, -33, -81, -99, -297, -891. Hence, factors of 891 in pair are (-1,-891), (-3,-297), (-9,-99), (-11,-81), (-27,-33).

Help Deep in writing the positive factors of 891 in pair and negative factor of 891 in pair.

Factors of 891 are 1, 3, 9, 11, 27, 33, 81, 99, 297, 891. Positive factors of 891 in pair are (1,891), (3,297), (9,99), (11,81), (27,33). Negative factors of 891 in pair are (-1,-891), (-3,-297), (-9,-99), (-11,-81), (-27,-33).

Find the product of all factors of 891.

Factors of 891 are 1, 3, 9, 11, 27, 33, 81, 99, 297, 891. So the product of all factors of 891 would be 1 x 3 x 9 x 11 x 27 x 33 x 81 x 99 x 297 x 891 = 561550114565451.

Find the product of all prime factors of 891.

Factors of 891 are 1, 3, 9, 11, 27, 33, 81, 99, 297, 891. Prime factors are 3, 3, 3, 3, 11. So, the product of all prime factors of 891 would be 3 x 3 x 3 x 3 x 11 = 891.

A student has been assigned the following tasks by the teacher:
- Finding out all positive factors of 891.
- Writing all prime factors of 891.
- Writing all the possible factors of 891 in pair.
Help him in writing all these.

Positive factors of 891 are 1, 3, 9, 11, 27, 33, 81, 99, 297, 891.
Prime factors of 891 are 3, 3, 3, 3, 11.
Factors of 891 in pair are (1,891), (3,297), (9,99), (11,81), (27,33).