Find the LCM and GCF of each set of numbers    1.)7 and 21

To find the Least Common Multiple (LCM) and the Greatest Common Factor (GCF) of the numbers 7 and 21, let's go through the process step by step.

### 1. **Greatest Common Factor (GCF):**
The GCF is the largest number that divides both numbers without leaving a remainder.

- **Factors of 7:** 1, 7
- **Factors of 21:** 1, 3, 7, 21

The common factors of 7 and 21 are 1 and 7. The greatest of these is **7**.

So, the **GCF of 7 and 21 is 7**.

### 2. **Least Common Multiple (LCM):**
The LCM is the smallest number that is a multiple of both numbers.

- **Multiples of 7:** 7, 14, 21, 28, 35, ...
- **Multip

Discover how to find the Least Common Multiple (LCM) and Greatest Common Factor (GCF) of numbers 7 and 21 with a step-by-step explanation. Learn about arithmetic operations and number theory concepts in this mathematical problem suitable for Grades 4-6.

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