Factors of 18 and 21

Factoring Common Factors of 18 and 21

Use the form below to do your conversion, Convert Number to factors, separate numbers by comma and find factors of a number.






What are the Factors of 18

Factors of 18 =1, 2, 3, 6, 9, 18

Distinct Factors of 18 = 1, 2, 3, 6, 9, 18,


Note: Factors of 18 and Distinct factors are the same.

Factors of -18 = -1, -2, -3, -6, -9, -18,

What are the Factors of 21

Factors of 21 =1, 3, 7, 21

Distinct Factors of 21 = 1, 2, 3, 6, 9, 18, 1, 3, 7, 21,


Note: Factors of 21 and Distinct factors are the same.

Factors of -21 = -1, -2, -3, -6, -9, -18, -1, -3, -7, -21,

Negative factors are just factors with negative sign.


How to calculate factors of 18 and 21

The factors are numbers that can divide 21 without remainder.

Every number is divisible by itself and 1.

Factors of 18

18/1 = 18         gives remainder 0 and so are divisible by 1
18/2 = 9         gives remainder 0 and so are divisible by 2
18/3 = 6         gives remainder 0 and so are divisible by 3
18/6 = 3         gives remainder 0 and so are divisible by 6
18/9 = 2         gives remainder 0 and so are divisible by 9
18/18 = 1         gives remainder 0 and so are divisible by 18

Factors of 21

21/1 = 21         gives remainder 0 and so are divisible by 1
21/3 = 7         gives remainder 0 and so are divisible by 3
21/7 = 3         gives remainder 0 and so are divisible by 7
21/21 = 1         gives remainder 0 and so are divisible by 21




The real common factors of 18,21 is 1, 3

LCM of 18 and 21


Multiples of 18= 18, 36, 54, 72, 90, 108, 126, 144, 162, 180, 198, 216, 234, 252, 270, 288, 306, 324, 342, 360,
Multiples of 21= 21, 42, 63, 84, 105, 126, 147, 168, 189, 210, 231, 252, 273, 294, 315, 336, 357,

Least common multiple (LCM) of 18 and 21= 126

HCF of 18 and 21

Highest common factor (HCF) is calculated using real common factors above

HCF of 18 and 21 = 3

GCF of 18 and 21

Greatest common factor (GCF) is the same as Highest common factor (HCF)

GCF of 18 and 21 = 3

LCD of 18 and 21

lowest common Denominator (LCD) is the same as Least common multiple (LCM)

lowest common Denominator (LCD) of 18 and 21= 252



We get factors of 18,21 numbers by finding numbers that can divide 18,21 without remainder or alternatively numbers that can multiply together to equal the target number being converted.

In considering numbers than can divide 18,21 without remainders. So we start with 1, then check 2,3,4,5,6,7,8,9, etc and 18,21

Getting factors is done by dividing 18,21 with numbers lower to it in value to find the one that will not leave remainder. Numbers that divide without remainders are the factors.

Factors are whole numbers or integers that are multiplied together to produce a given number. The integers or whole numbers multiplied are factors of the given number. If x multiplied by y = z then x and y are factors of z.

if for instance you want to find the factors of 20. You will have to find combination of numbers that when it is multiplied together will give 20. Example here is 5 and 4 because when you multiplied them, it will give you 20. so they are factors of the given number 20. Also 1 and 20, 2 and 10 are factors of 20 because 1 x 20 = 20 and 2 x 10 = 20. The factors of the given interger number 20 are 1, 2, 4, 5, 10, 20

To calculate factors using this tool, you will enter positive integers, because the calculator will only allow positive values, to calculate factors of a number. if you need to calculate negative numbers, you enter the positive value, get the factors and duplicate the answer yourself with all the give positive factors as negatives like as -5 and -6 as factors of number 30. On the other hand this calculator will give you both negative factors and positive integers for numbers. For instance, -2 , -3,-4 etc.

factors is like division in maths, because it gives all numbers that divide evenly into a number with no remainder. example is number 8. it is is evenly divisible by 2 and 4, which means that both 2 and 4 are factors of number 10.

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