ACT Math : How to find the decimal equivalent of a fraction

Study concepts, example questions & explanations for ACT Math

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Example Questions

Example Question #251 : Arithmetic

When 5/11 is written as a decimal, what is the 100th digit to the right of the decimal point?

Possible Answers:

2

4

0

5

1

Correct answer:

5

Explanation:

When 5 is divided by 11, the decimal is 0.45 repeating, with a 5 in the hundreths place. The key here is to recognize that 100 is an even number, and the 5 in 0.45 is two places to the right of the decimal point (2 also being an even number).

Example Question #1 : Decimals

Find  the sum of the following:

 \(\displaystyle 5\frac{1}{8}+6\frac{3}{16}?\)

Possible Answers:

\(\displaystyle 11.1875\)

\(\displaystyle 11.3125\)

\(\displaystyle 11.25\)

\(\displaystyle 11.125\)

\(\displaystyle 11.625\)

Correct answer:

\(\displaystyle 11.3125\)

Explanation:

To get the decimal from a fraction, divide the numerator by the denominator

\(\displaystyle \frac{1}{8}=0.125\)

\(\displaystyle 5\frac{1}{8}=5.125\)

\(\displaystyle \frac{3}{16}=0.1875\)

\(\displaystyle 6\frac{3}{16}=6.1875\)

\(\displaystyle 5.125+6.1875=11.3125\)

Example Question #251 : Arithmetic

Find the sum to the nearest hundredth:

\(\displaystyle 13\frac{3}{8} + 12\frac{17}{40} ?\)

Possible Answers:

\(\displaystyle 26.3\)

\(\displaystyle 27.4\)

\(\displaystyle 28.9\)

\(\displaystyle 25.8\)

\(\displaystyle 24.3\)

Correct answer:

\(\displaystyle 25.8\)

Explanation:

1. Convert the fractions to decimals by division:

\(\displaystyle \frac{3}{8}=0.375\)

\(\displaystyle \frac{17}{40}=0.425\)

2. Add the corresponding whole numbers to the decimals:

\(\displaystyle 13+0.375=13.375\)

\(\displaystyle 12+0.425=12.425\)

3. Add the two decimals:

\(\displaystyle 13.375 + 12.425 = 25.8\)

Example Question #1 : Decimals

 If \(\displaystyle \frac{1}{3} < x < 0.76\)\(\displaystyle x\) can equal which of the following?

Possible Answers:

\(\displaystyle \frac{5}{16}\)

\(\displaystyle \frac{2}{5}\)

None of the other answer choices are correct

\(\displaystyle \frac{4}{12}\)

\(\displaystyle \frac{1}{4}\)

Correct answer:

\(\displaystyle \frac{2}{5}\)

Explanation:

Convert all of the fractions to decimals. Thus, x is contained within the range of 0.33 < x < 0.76. The answers choices become 1/4 = 0.25, 4/12 = 0.33, 2/5 = 0.4, and 5/16 = 0.3125, respectively.  Therefore, the only answer which is within the desired range is 2/5.

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