 # What Is The Factor Of 21?

## What is the factor for 20?

Note: If a number can be expressed as a product of two whole numbers, then the whole numbers are called factors of that number.

So, the factors of 20 are 1, 2, 4, 5, 10 and 20..

## What is the factor of 21 and 35?

We found the factors and prime factorization of 21 and 35. The biggest common factor number is the GCF number. So the greatest common factor 21 and 35 is 7.

## What are the first 5 multiples of 21?

Thus, the first five multiples of 21 are 21, 42, 63, 84 and 105.

## What is the common factor of 21 and 28?

Greatest common factor (GCF) of 21 and 28 is 7.

## What is 21 a multiple of?

Table of Factors and MultiplesFactorsMultiples1, 3, 7, 21211261, 2, 11, 22221321, 23231381, 2, 3, 4, 6, 8, 12, 242414441 more rows

## Is 21 a square number?

Meaning. Informally: When you multiply a whole number times itself, the resulting product is called a square number, or a perfect square or simply “a square.” So 1, 4, 9, 16, 25, 36, 49, 64, 81, 100, 121, 144, and so on, are all square numbers.

## What is the factor of 18?

Factors of 18: Testing the integer values 1 through 4 for division into 18 with a 0 remainder we get these factor pairs: (1 and 18), (2 and 9), (3 and 6). The factors of 18 are 1, 2, 3, 6, 9, 18.

## What 3 numbers make 21?

Therefore, three consecutive integers that add up to 21 are 6, 7, and 8. We know our answer is correct because 6 + 7 + 8 equals 21 as displayed above.

## What is the GCF of 21 and 4?

Greatest common factor (GCF) of 4 and 21 is 1. We will now calculate the prime factors of 4 and 21, than find the greatest common factor (greatest common divisor (gcd)) of the numbers by matching the biggest common factor of 4 and 21.

## What is the factor of 81?

81 is a composite number and is 9 squared. 81 = 1 x 81, 3 x 27, or 9 x 9. Factors of 81: 1, 3, 9, 27, 81. Prime factorization: 81 = 3 x 3 x 3 x 3 which can also be written 3⁴.

## What is the GCF of 15 and 25?

We found the factors and prime factorization of 15 and 25. The biggest common factor number is the GCF number. So the greatest common factor 15 and 25 is 5.

## What is the HCF of 18 and 24?

We found the factors and prime factorization of 18 and 24. The biggest common factor number is the GCF number. So the greatest common factor 18 and 24 is 6.

## What is the factor tree for 21?

The number 21 is a composite number because 21 can be divided by 1, by itself and at least by 3 and 7. So, it is possible to draw its prime tree. The prime factorization of 21 = 3•7.

## What are 4 factors of 21?

The factors of a number 21 are the numbers, that produce the result as 21 when a pair factor is multiplied together. These factors are 1, 3, 7 and 21.

## What is a factor of 24?

24 Think You Have a Snow Problem? Try This:24 is a composite number.Prime factorization: 24 = 2 x 2 x 2 x 3, which can be written 24 = 2³ x 3.The exponents in the prime factorization are 3 and 1. … Factors of 24: 1, 2, 3, 4, 6, 8, 12, 24.Factor pairs: 24 = 1 x 24, 2 x 12, 3 x 8, or 4 x 6.More items…•

## What is the GCF of 18 and 27?

Example: Find the GCF of 18 and 27 The factors of 18 are 1, 2, 3, 6, 9, 18. The factors of 27 are 1, 3, 9, 27. The common factors of 18 and 27 are 1, 3 and 9. The greatest common factor of 18 and 27 is 9.

## What is the sum of the factors of 21?

Therefore the factors of 21 are 1, 3, 7 and 21. All that is left to do is to work out the sum of these numbers, that is to add them all up. 21+1 + 3 +7 = 32Therefore, the sum of the factors of 21 is 32.

## What is the highest factor of 21?

Factors of 21: 1, 3, 7, 21. Prime factorization: 21 = 3 x 7.

## What are 2 factors of 20?

20 Underestimation 20 is a composite number. 20 = 1 x 20, 2 x 10, or 4 x 5. Factors of 20: 1, 2, 4, 5, 10, 20. Prime factorization: 20 = 2 x 2 x 5, which can also be written 20 = 2² x 5.

## What is the GCF of 15 and 20?

We found the factors and prime factorization of 15 and 20. The biggest common factor number is the GCF number. So the greatest common factor 15 and 20 is 5.

## What is the factor of 10?

The factors of 10 are 1, 2, 5, and 10. You can also look at this the other way around: if you can multiply two whole numbers to create a third number, those two numbers are factors of the third. 2 x 5 = 10, so 2 and 5 are factors of 10. 1 x 10 = 10, so 1 and 10 are also factors of 10.