Leading zeros are not significant digits, therefore 007 has one.
Three tenths.
46 tenths
There are 6 tenths in 0.6
45 tenths
There are 9 tenths in 9 tenths.
6.4 of them. 6 and 4 tenths has 64 of them.
13.5 is equal to 135 tenths.
One and it is 7
There are 19 tenths
114 tenths.
7 tenths