Is .9 the same as 0.9?

Answer 1

Yes, they mean the same thing.

In the real world, it is better to write a decimal fraction with a leading zero; otherwise, the number could be misread if the decimal point is overlooked.

Answer 2

Yes, .9 is the same as 0.9. The decimal point in .9 is implied, so it is equivalent to 0.9. In decimal notation, the leading zero is often omitted, but it does not change the value of the number. Both .9 and 0.9 represent the same quantity, which is nine-tenths.