Lowest common denominator is 20, so change 3/4 + 7/10 to 15/20 + 14/20 = 29/20 or 1 and 9/20
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1.3 + 0.75 = 2.05
Five tenths
Three and three fourths plus three is six and three fourths.
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.
2.15 or 2 and three twentieths