9 tenths - 3 tenths = 6 tenths. this is true the same way that 9 minus 3 = 6. In reality the tenths make both numbers decimals, but in this case the "tenths" is just a classification of the number and it doesn't effect the answer.
9 tenths - 3 tenths = 6 tenths. This problem is just a reflection on basic math. If you take away the word tenths you have the basic problem 9 - 3 = 6. In math, usually the word tenths means that it is being converted to a decimal place (the first to be exact) but in the case, it is just a type of measurement.
