Eight and four tenths : 8.4
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You make eight and one tenth 8.1 to be a decimal.
8.1
Eight and four tenths in decimal form = 8.4
four and eight millionths = 4.000008
In a tenth, you move the decimal over on place (to the right). For example, if you are writing eight-tenths, it would be 8/10 which is .8.