Factors of 155

Every number, except 1 and 0, will have a minimum of 2 factors. 

Factors of 155: 1,155, 5, 31
Negative factors of 155: -1,-155,-5,-31
Prime factorization of 155: 5×31
Sum of factors: 1+155+5+31=192
 

The methods mentioned below can be used to find the factors of 155. Use any factor-finding method that is easy for you. 

— Multiplication method 
— Division method 
— Prime factorization and prime factors method
— Factor tree method
 

Find the pair of numbers which when multiplied gives 155.

155 is a composite number because it has more than 2 factors.

The factor pairs of 155 are

Positive factor pairs : (1,155) (5,31) 
Negative factor pairs : (-1,-155) (-5,-31)

Start dividing 155 with small numbers and check the remainder.

Dividend = Divisor x Quotient + Remainder

The factors of 155 are 1,5,31,155 and -1,-5,-31,-155.
 

• Prime factors of 155: 5,31

• The prime factorization of 155= 5×31

• The positive factors of 155 are 1,5,31,155. The negative factors are -1,-155,-5,-31.
   

Factor tree is a graphical representation of breaking down any number into prime factors.

In case of 155, 

Step 1: First, we write the number on top (in this case, 155). From there, it will be broken down into 2 parts.

Step 2: Fill in the factor pairs of 155 in separate steps. In this step, the number will be factorized into 5 and 31.

Step 3: From this we can find that the prime factors of 5 and 31. This is how the factor tree helps students visualize the factors more easily.
 

Factor pairs are a combination of two numbers, a and b, whose product is equal to 155. So, over here, a and b are a factor pair of 155.

The factor pairs of 155 are

Positive factor pairs -- (1,155) (5,31) 
Negative factor pairs -- (-1,-155) (-5,-31)

• Factors: Factors are numbers that, when multiplied together, result in a given number.  Example: Factors of 12 are:1 × 12 = 12, 2 × 6 = 12, 3 × 4 = 12. Here, 1, 2, 6, 3, 4 and 12 are the factors of 12.

• Greatest Common Factor (GCF): The greatest number that divides the given number exactly and is a common factor for the given number is called GCF. An example for GCF is: The GCF of 1500, 10, and 100 is 10. Because it is the greatest factor that is common for all three numbers.

• Prime number: Any number greater than 1 and has only 2 factors is called a prime number. Example: 811/1 = 811 and 811/811 = 1. We can see that 811 can be divided exactly by only 2 numbers. Those two numbers are 1 and 811.

• Divisor: Any number that divides another number exactly and leaves no remainder is called a divisor. When we divide 12 by 3, we get a quotient of 4. Here, the divisor is 3 and the dividend is 12.