20/100 is 2/10 so .2 and 30 is not a fraction so you add and your result is 30.2.
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seven and thirty one thousandths= 7.031 in decimal= 7031/1000 in decimal fraction
-- Convert a decimal into a fraction:Read the decimal out loud, and quickly write down what you hear yourself saying.For example, if you see " 0.37 " on the paper, you read "thirty-seven hundredths",and when you hear "thirty-seven hundredths", you write down ' 37/100 '.-- Convert a fraction into a decimal:Perform the indicated division. For example, if you see " 37/95 " on the paper, yousay to yourself "That fraction means thirty-seven divided by ninety-five." So yousit down, take your pencil, and divide 37 by 95, and you get 0.38947 and somemore numbers. (In fact, you can keep going as long as you want to, becausethe decimal never ends.)
You do thirty two thosand
8.38
Expressed as a decimal fraction, 33/50 is equal to 0.66.