Answer :

Edmonton
10.4 = 10 4/10
       = 10 2/5
I have reduced 4/10 to 2/5 (simplest form) by dividing both by 2.

Hope this helps!
[tex]10.4=10+0.4=10+\frac{4}{10}=10+\frac{4:2}{10:2}=10+\frac{2}{5}=\boxed{10\frac{2}{5}}[/tex]

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