Official Solution:

\(\frac{0.02}{0.1} + \frac{0.05}{0.001} = ?\)

A. 50200
B. 50.2
C. 5.02
D. 0.502
E. 502


One way to add two decimal fractions is to find a common denominator. Another way is to multiply each denominator by a certain number that will result in 1. To convert the denominator of the first fraction, multiply it by 10. The numerator should be multiplied by the same number as the denominator. Apply the same method to the second fraction and multiply it by 1,000. The result:
\(\frac{0.2}{1} + \frac{50}{1} = 0.2 + 50 = 50.2\)

Therefore, the correct answer is 50.2


Answer: B
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<Another way is to multiply each denominator by a certain number that will result in 1. >

Sometimes you mis so easy little things

\(\frac{2*10}{1*100} + \frac{5*1000}{1*100}\)
\(0.2+50\)
\(50.2\)

I mean during the test, I would do this way to be absolutely rock solid.

If you are smart then you can just see whats happening and figure out the answer too. For example, the LHS of "+" will result in 0.2 so you can eliminate A and E. But you need to be sure that RHS won't result a decimal for it.

So to avoid everything just write the zeros.
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