Original price is $29.99 markdown is 33 1/3%

First, you convert 33 1/3 % into decimals which is 0.33333333333 then you multiply 29.99 by the decimal to get the amount you save which is then subtracted from the initial amount.
29.99 x 0.33 1/3 = 9.99667
29.99 - 9.99667 = 19.99

Hope this helps!

Rounding decimals is very similar to rounding other numbers. if the hundredths and thousandths places of a decimal is forty-nine or less, they are dropped and the tenths place does not change. for example, rounding 0.843 to the nearest tenth would give 0.8. , your welcome !