3/10 = 9/30 and 2/15 = 4/30
9/30 + 4/30 = 13/30
13/30
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three fifteenths
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.
Two and eight tenths.
5 and 5/10
four tenths; six fifteenths S. from California