To convert \( \frac{12}{30} \) to a decimal using long division, we can follow these steps:
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First, we'll simplify \( \frac{12}{30} \) to \( \frac{2}{5} \) by dividing both the numerator and denominator by 6.
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Next, we perform long division of \( 2 \div 5 \).
- Since 2 is less than 5, we start with \( 0 \) and add a decimal point to give 2.0.
- Now, consider \( 20 \div 5 \).
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\( 5 \) goes into \( 20 \) exactly \( 4 \) times, as \( 5 \times 4 = 20 \).
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So, we place \( 4 \) in the decimal place.
Combining this, we get the decimal representation:
\[ \frac{12}{30} = 0.4 \]
Therefore, the answer is:
0.4