Factors of a Number
The factor of a number is an integer that divides the given number without leaving a remainder. A given number can have one or more factors.
Factors of a Number
Finding the Factors of a Number
The factors of a number are the integers that divide the given number exactly, without leaving a remainder. Every positive integer has at least two factors: 1 and the number itself. However, many numbers have additional factors as well.
To find the factors of a number, we test each integer from 1 up to the number itself to see if it divides the number with no remainder. If it does, that integer is a factor of the number. If it does not, then that integer is not a factor.
Examples
Let’s explore some examples to understand how we can find the factors of a given number.
1. Find the factors of 12.
Answer
First, we identify the given number:
Given:
- n = 12
Next, we check each integer from 1 to 12 to see if it divides 12 without leaving a remainder:
Steps:
- 1 divides 12: 12 % 1 = 0 → Factor
- 2 divides 12: 12 % 2 = 0 → Factor
- 3 divides 12: 12 % 3 = 0 → Factor
- 4 divides 12: 12 % 4 = 0 → Factor
- 5 does not divide 12: 12 % 5 ≠ 0 → Not a Factor
- 6 divides 12: 12 % 6 = 0 → Factor
- 7 does not divide 12: 12 % 7 ≠ 0 → Not a Factor
- 8 does not divide 12: 12 % 8 ≠ 0 → Not a Factor
- 9 does not divide 12: 12 % 9 ≠ 0 → Not a Factor
- 10 does not divide 12: 12 % 10 ≠ 0 → Not a Factor
- 11 does not divide 12: 12 % 11 ≠ 0 → Not a Factor
- 12 divides 12: 12 % 12 = 0 → Factor
The integers 1, 2, 3, 4, 6, and 12 all divide 12 exactly, so they are factors of 12. The remaining numbers are not factors.
Result:
∴ The factors of 12 are: 1, 2, 3, 4, 6, 12.
2. Find the factors of 28.
Answer
We start by identifying the number:
Given:
- n = 28
We then check each integer from 1 to 28 to see if it divides 28 without leaving a remainder:
Steps:
- 1 divides 28: 28 % 1 = 0 → Factor
- 2 divides 28: 28 % 2 = 0 → Factor
- 3 does not divide 28: 28 % 3 ≠ 0 → Not a Factor
- 4 divides 28: 28 % 4 = 0 → Factor
- 5 does not divide 28: 28 % 5 ≠ 0 → Not a Factor
- 6 does not divide 28: 28 % 6 ≠ 0 → Not a Factor
- 7 divides 28: 28 % 7 = 0 → Factor
- 8 does not divide 28: 28 % 8 ≠ 0 → Not a Factor
- 9 does not divide 28: 28 % 9 ≠ 0 → Not a Factor
- 10 does not divide 28: 28 % 10 ≠ 0 → Not a Factor
- 11 does not divide 28: 28 % 11 ≠ 0 → Not a Factor
- 12 does not divide 28: 28 % 12 ≠ 0 → Not a Factor
- 13 does not divide 28: 28 % 13 ≠ 0 → Not a Factor
- 14 divides 28: 28 % 14 = 0 → Factor
- 15 does not divide 28: 28 % 15 ≠ 0 → Not a Factor
- 16 does not divide 28: 28 % 16 ≠ 0 → Not a Factor
- 17 does not divide 28: 28 % 17 ≠ 0 → Not a Factor
- 18 does not divide 28: 28 % 18 ≠ 0 → Not a Factor
- 19 does not divide 28: 28 % 19 ≠ 0 → Not a Factor
- 20 does not divide 28: 28 % 20 ≠ 0 → Not a Factor
- 21 does not divide 28: 28 % 21 ≠ 0 → Not a Factor
- 22 does not divide 28: 28 % 22 ≠ 0 → Not a Factor
- 23 does not divide 28: 28 % 23 ≠ 0 → Not a Factor
- 24 does not divide 28: 28 % 24 ≠ 0 → Not a Factor
- 25 does not divide 28: 28 % 25 ≠ 0 → Not a Factor
- 26 does not divide 28: 28 % 26 ≠ 0 → Not a Factor
- 27 does not divide 28: 28 % 27 ≠ 0 → Not a Factor
- 28 divides 28: 28 % 28 = 0 → Factor
The integers 1, 2, 4, 7, 14, and 28 all divide 28 exactly, so they are factors of 28. The remaining numbers are not factors.
Result:
∴ The factors of 28 are: 1, 2, 4, 7, 14, 28.
3. Determine the factors of 15.
Answer
We begin by identifying the number:
Given:
- n = 15
Next, we check each integer from 1 to 15 to see if it divides 15 without leaving a remainder:
Steps:
- 1 divides 15: 15 % 1 = 0 → Factor
- 2 does not divide 15: 15 % 2 ≠ 0 → Not a Factor
- 3 divides 15: 15 % 3 = 0 → Factor
- 4 does not divide 15: 15 % 4 ≠ 0 → Not a Factor
- 5 divides 15: 15 % 5 = 0 → Factor
- 6 does not divide 15: 15 % 6 ≠ 0 → Not a Factor
- 7 does not divide 15: 15 % 7 ≠ 0 → Not a Factor
- 8 does not divide 15: 15 % 8 ≠ 0 → Not a Factor
- 9 does not divide 15: 15 % 9 ≠ 0 → Not a Factor
- 10 does not divide 15: 15 % 10 ≠ 0 → Not a Factor
- 11 does not divide 15: 15 % 11 ≠ 0 → Not a Factor
- 12 does not divide 15: 15 % 12 ≠ 0 → Not a Factor
- 13 does not divide 15: 15 % 13 ≠ 0 → Not a Factor
- 14 does not divide 15: 15 % 14 ≠ 0 → Not a Factor
- 15 divides 15: 15 % 15 = 0 → Factor
The integers 1, 3, 5, and 15 all divide 15 exactly, so they are factors of 15. The remaining numbers are not factors.
Result:
∴ The factors of 15 are: 1, 3, 5, 15.
4. Find the factors of 20.
Answer
We start by identifying the number:
Given:
- n = 20
We then check each integer from 1 to 20 to determine if it divides 20 without leaving a remainder:
Steps:
- 1 divides 20: 20 % 1 = 0 → Factor
- 2 divides 20: 20 % 2 = 0 → Factor
- 3 does not divide 20: 20 % 3 ≠ 0 → Not a Factor
- 4 divides 20: 20 % 4 = 0 → Factor
- 5 divides 20: 20 % 5 = 0 → Factor
- 6 does not divide 20: 20 % 6 ≠ 0 → Not a Factor
- 7 does not divide 20: 20 % 7 ≠ 0 → Not a Factor
- 8 does not divide 20: 20 % 8 ≠ 0 → Not a Factor
- 9 does not divide 20: 20 % 9 ≠ 0 → Not a Factor
- 10 divides 20: 20 % 10 = 0 → Factor
- 11 does not divide 20: 20 % 11 ≠ 0 → Not a Factor
- 12 does not divide 20: 20 % 12 ≠ 0 → Not a Factor
- 13 does not divide 20: 20 % 13 ≠ 0 → Not a Factor
- 14 does not divide 20: 20 % 14 ≠ 0 → Not a Factor
- 15 does not divide 20: 20 % 15 ≠ 0 → Not a Factor
- 16 does not divide 20: 20 % 16 ≠ 0 → Not a Factor
- 17 does not divide 20: 20 % 17 ≠ 0 → Not a Factor
- 18 does not divide 20: 20 % 18 ≠ 0 → Not a Factor
- 19 does not divide 20: 20 % 19 ≠ 0 → Not a Factor
- 20 divides 20: 20 % 20 = 0 → Factor
The integers 1, 2, 4, 5, 10, and 20 all divide 20 exactly, so they are factors of 20. The remaining numbers are not factors.
Result:
∴ The factors of 20 are: 1, 2, 4, 5, 10, 20.