Solution: 128.2 as a fraction is 641/5
Methods
Converting 128.2 to a fraction, Step-by-Step
Step 1:
The first step to converting 128.2 to a fraction is to re-write 128.2 in the form p/q where p and q are both positive integers. To start with, 128.2 can be written as simply 128.2/1 to technically be written as a fraction.
Step 2:
Next, we will count the number of fractional digits after the decimal point in 128.2, which in this case is 1. For however many digits after the decimal point there are, we will multiply the numerator and denominator of 128.2/1 each by 10 to the power of that many digits. For instance, for 0.45, there are 2 fractional digits so we would multiply by 100; or for 0.324, since there are 3 fractional digits, we would multiply by 1000. So, in this case, we will multiply the numerator and denominator of 128.2/1 each by 10:
128.2
×
10
1
×
10
=
1282
10
\frac{128.2 × 10}{1 × 10} = \frac{1282}{10}
1 × 10 128.2 × 10 = 10 1282
Step 3:
Now the last step is to simplify the fraction (if possible) by finding similar factors and cancelling them out, which leads to the following answer:
1282
10
=
641
5
\frac{1282}{10} = \frac{641}{5}
10 1282 = 5 641
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