2.7 + 2.8 = 5.5 = 5 and 1/2
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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.
7/10
4/5 is what a half plus three tenths equals.
3.8 + 2.9 = 6.7
4/10 plus 2/5 = 4/5 in its simplest form