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How do you convert 0.15 repeating as a fraction?

Answer
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Hint: In this problem we need to convert the given decimal into the fraction. Generally, the conversion of the decimals into fractions depends on whether the digits in the decimal are being repeated or not. In the problem they have mentioned that the digits are repeating. So, we will first assume the given decimal is equal to a variable let’s say x. Now we will observe how many digits are repeated in the given decimal. We need to multiply with 10n where n is the number of repeated digits. Now we will subtract both the values and simplify it to get the result.

Complete step-by-step solution:
Given decimal 0.15.
Let x=0.15
Given that 15 is being repeated. In 15 we have 2 digits. So, we will multiply with 102 on both sides of the above equation, then we will get
x×102=0.15×102
We know that 102=100. Substituting this value in the above equation, then we will have
x×100=0.15×100
Given that 15 is being repeated, so we can write
100x=15.15
Subtracting the value of x from the above equation, then we will get
100xx=15.150.1599x=15
Dividing the above equation with 99 on both sides, then we will get
99x99=1599
Cancelling the 99 which is in both numerator and denominator in the left-hand side, then we will get
x=1599
We can write 15=5×3 and 99=3×33. Substituting these values in the above equation, then we will get
x=5×333×3
Cancelling the 3 which is in both numerator and denominator, then we will have
x=533
At the beginning we have assumed that x=0.15. From this we can write
0.15=533
Hence the fractional form of the given decimal 0.15 is 533.

Note: In this problem they have particularly mentioned that the digits are repeated in the given decimal value. So, we have followed the above-mentioned method. If they have not mentioned that the digits are repeated, then it can be easier to convert the given decimal value into fraction. We have two digits after the decimal so we will divide the given number with 102 and remove the decimal point. Then we will get 0.15=15100.


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