1/10 + 1/5 =3/10. This is because, to add or subtract fractions, you must get them to have a common denominator. You can then convert 1/5 to 2/10 so that it shares a common denominator with the fraction 1/10. You then add the numerators, and 1+2=3, therefore your sum of the two fractions is 3/10, or 3 over 10.
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1/5 + 1/10= 3/10
It is: 3/10
One tenth
One fifth plus one fifth is two fifths (2/5).
Well, a fifth is one fifth of one, that's why it's called a fifth, it's divided into five. If your question was 'what is a fifth a tenth of?', then the answer would be two. What is a fifth a seventh of? 1.4, etc.