Expressed as a decimal fraction, 4/10 is equal to 0.4.
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4.5 is already a decimal. In words it is four and five tenths.
Four tens is 40.0 Four tenths is 0.4
423.4
4.3 43/10
Well, honey, to write four and two tenths percent as a decimal, you just move that decimal point two places to the left. So, you end up with 0.042. Easy peasy lemon squeezy!