99.999 + 0.99 + 0.00991234 = ?

Options

A. a. 100
B. b. 10000
C. c. 1000
D. d. 100000

Answer

To solve the problem \( 99.999 + 0.99 + 0.00991234 \), we will follow these steps:

### Step 1: Align the numbers
Align the numbers by their decimal points to make addition easier.

```
99.99900000
+ 0.99000000
+ 0.00991234
```

### Step 2: Add the numbers column by column
Start adding from the rightmost column to the leftmost column.

1. **Rightmost column (thousandths place)**:
- \( 0 + 0 + 4 = 4 \)

2. **Next column (hundredths place)**:
- \( 0 + 0 + 3 = 3 \)

3. **Next column (tenths place)**:
- \( 0 + 9 + 1 = 10 \) (write down 0 and carry over 1)

4. **Next column (units place)**:
- \( 9 + 9 + 0 + 1 \text{ (carried over)} = 19 \) (write down 9 and carry over 1)

5. **Next column (tens place)**:
- \( 9 + 0 + 0 + 1 \text{ (carried over)} = 10 \) (write down 0 and carry over 1)

6. **Next column (hundreds place)**:
- \( 9 + 0 + 0 + 1 \text{ (carried over)} = 10 \) (write down 0 and carry over 1)

7. **Next column (thousands place)**:
- \( 0 + 0 + 0 + 1 \text{ (carried over)} = 1 \)

### Step 3: Write down the final result
Putting it all together, we have:

```
99.99900000
+ 0.99000000
+ 0.00991234
-----------------
100.99991234
```

So, the final answer is \( 100.99991234 \).