What should be added to 3.07 to get 3.5?

Options

A. 0.57
B. 0.430
C. 0.43
D. 0.02

Answer

To solve the question "What should be added to 3.07 to get 3.5?", we can follow these steps:

### Step-by-Step Solution:

1. **Identify the equation**: We need to find a number (let's call it \( x \)) that, when added to 3.07, equals 3.5. This can be expressed as:
\[ 3.07 + x = 3.5 \]

2. **Rearrange the equation**: To isolate \( x \), we can subtract 3.07 from both sides of the equation:
\[ x = 3.5 - 3.07 \]

3. **Perform the subtraction**: Now, we need to calculate \( 3.5 - 3.07 \). To do this, we can align the decimal points:
\[ \begin{array}{r} 3.50 \\ -3.07 \\ \hline \end{array} \]

Now, subtract starting from the right:
- In the hundredths place: \( 0 - 7 \) requires borrowing, so we take 1 from the tenths place (making it 4), and the hundredths becomes \( 10 - 7 = 3 \).
- In the tenths place: \( 4 - 0 = 4 \).
- In the units place: \( 3 - 3 = 0 \).

So, we have:
\[ 3.50 - 3.07 = 0.43 \]

4. **Conclusion**: Therefore, the value of \( x \) is:
\[ x = 0.43 \]

### Final Answer:
To get 3.5, you should add **0.43** to 3.07.

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