Well, honey, if you want to get technical, three and four tenths as a decimal is 3.4. It's as simple as that. Math doesn't have to be a headache, darling.
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423.4
Expressed as a decimal, 3 4/10 is equal to 3.4.
Three tenths is .3 as a decimal.
Three and ten tenths is equal to four. This is written as 4, and if accuracy to tenths is required, it is written as 4.0.
4.3 43/10