Find the sum of first 5 multiples of 7.

Options

A. 105
B. 130
C. 140
D. 125

Answer

To find the sum of the first 5 multiples of 7, we can follow these steps:

### Step 1: Identify the first 5 multiples of 7.
The multiples of 7 can be found by multiplying 7 by the integers 1 through 5.

1. First multiple: \( 7 \times 1 = 7 \)
2. Second multiple: \( 7 \times 2 = 14 \)
3. Third multiple: \( 7 \times 3 = 21 \)
4. Fourth multiple: \( 7 \times 4 = 28 \)
5. Fifth multiple: \( 7 \times 5 = 35 \)

### Step 2: List the multiples.
The first 5 multiples of 7 are:
- 7
- 14
- 21
- 28
- 35

### Step 3: Calculate the sum of these multiples.
Now, we will add these multiples together:
\[ 7 + 14 + 21 + 28 + 35 \]

### Step 4: Perform the addition.
Let's add them step by step:
1. \( 7 + 14 = 21 \)
2. \( 21 + 21 = 42 \)
3. \( 42 + 28 = 70 \)
4. \( 70 + 35 = 105 \)

### Step 5: State the final answer.
The sum of the first 5 multiples of 7 is \( 105 \).

---