Well, we know that a common denominator of 1/5 and 2/7 is there denominators multiplied together, that is, 5x7 = 35.
So, let's see . . . ummm . . . 1/5 is the same as 7/35 (I divided "5" into "35") and similarly, 2/7 = 10/35.
Then you add them together 7/35 + 10/35 = 17/35ths. This fraction cannot be reduced further.
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4 1/7 (four and one seventh).
One fifth plus one fifth is two fifths (2/5).
Ten sevenths or one and three sevenths
1/5 + 1/5 = 2/5
Three sevenths plus six sevenths equals nine sevenths. To add fractions with the same denominator, you simply add the numerators together and keep the denominator the same. In this case, 3 + 6 = 9, so the sum is 9/7.