Four
There is one significant digit in the number 10, as written.
2 of them.
10 numbers in a billion
I think you meant how many significant figures are in 10? The answer is one.
10 significant figures.
Instruction (AFI) 10-2501
There is one significant digit in the number 10, as written.
Two
2
butt
2 of them.
Instruction (AFI) 10-2501
afi 10-2501
Policy for DoD safety and occupational health
There are 10 whole numbers in 10 to 19.
Afi 10-2501
10*10