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Q: What is 1 plus three tenths plus nine hundreths?

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17/50

12/10 or 6/5

one and five tenths or one and a half

twelve and nine tenths/one hundred and twenty nine over ten/12.9

It is one and nine twentieths.

The sum of (eight and nine tenths) plus (nine and eight tenths) is (eighteen and seven tenths). 8.9 + 9.8 = 18.7

Thirteen tenths

nine tenths

9 tenths

9/10 + 13/4 = 2 13/20

⁹/₁₀ + ¹¹/₂₀ =¹⁸/₂₀ + ¹¹/₂₀ =²⁹/₂₀ or 1.45

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