The sum of 9/10 and 3/5 is 1 1/2 or 1.5
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twelve and nine tenths/one hundred and twenty nine over ten/12.9
Nine tenths plus two fifths minus one fourth is equal to 1.05
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.
4/5 is what a half plus three tenths equals.
nine fifths 18/10 = 9/10 + 9/10 18/10 = 9/5