10.0 Because it says I have tens ones so the .0 is the ones because it is a one digit number and the tens are the 10 because it is a 2 digit number and all 2 digit numbers are tens so if we have it 0.9 X 10.0 it will = 9 and if you say the question is 9 not 0.9 well te zero = nothing so it is not there and if the is no number before the . it should not be there so it is not witch only leaves the 9 witch means we can write 0.9 because the 0. are not there
