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Let's work through finding the factors of each of the given numbers:

- **Ex. 15**: The factors are listed as 1, 3, 5, and 15. These are all numbers that divide evenly into 15.

Now for the other numbers:

### a) 21:
The factors of 21 are:
- 1
- 3
- 7
- 21

### b) 28:
The factors of 28 are:
- 1
- 2
- 4
- 7
- 14
- 28

### c) 42:
The factors of 42 are:
- 1
- 2
- 3
- 6
- 7
- 14
- 21
- 42

### d) 60:
The factors of 60 are:
- 1
- 2
- 3
- 4
- 5
- 6
- 10
- 12
- 15
- 20
- 30
- 60

These are all the factors of the given numbers.

Do you have any questions or need further details? Here are some related questions to deepen your understanding:

1. What is the difference between a factor and a multiple?
2. How can you use prime factorization to find the factors of a number?
3. What are the factors of 100? Can you list them?
4. How can you determine if a number is prime or composite based on its factors?
5. How would the process change if you were asked to find the common factors between two numbers?

**Tip**: When looking for factors of a number, remember that factors always come in pairs, where one factor is smaller and the other is larger.

Find all the factors of each of the numbers: 21, 28, 42, and 60.

Learn how to find the factors of 21, 28, 42, and 60 with a clear and detailed explanation. Understand the concept of factors and divisibility with examples. Suitable for students in Grades 4-6.

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