7 and 1/10
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Multiply two fifths by two to get a common denominator. Then you will have 4 tenths plus three tenths. then add straight across and you will get seven tenths.
It is the same as: 1/5+2/5 = 3/5
4/5 is what a half plus three tenths equals.
4/10 plus 2/5 = 4/5 in its simplest form
6 tenths 2/5 = 4/10 2/10 + 4/10 = 6/10