Oh, dude, it's like you take 215 and divide it by 1,000. So, you move the decimal point three places to the left, and you get 0.215. Voila! You've got two hundred and fifteen thousandths in decimal form. Easy peasy lemon squeezy.
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To write two hundred and fifteen thousandths in decimal form, you would write it as 0.215. This is because each place value after the decimal point represents a power of 10 that is a negative exponent. In this case, the digit '2' is in the tenths place (10^-1), the digit '1' is in the hundredths place (10^-2), and the digit '5' is in the thousandths place (10^-3).
Well, honey, you take the number 215 and slap a decimal point in front of it, then add three zeros after it to represent the thousandths. Voilà, you've got 0.215 in decimal form. Now go out there and conquer those math problems like the boss you are!
Fifteen and three hundred thousandths
Sixteen hundred-thousandths in decimal form is 0.00016
Thirteen hundred thousandths
Three hundred seven thousandths = 0.307
Four and three hundred fifteen thousandths.