What is meant by 1 place precision?

Question

Is that the same thing as one decimal place?

Answer 1

Back in my day as a budding mathematician (1960's and 70's) 1 place precision meant that you could only 'trust' the answer to one digit.

For example, 'What is 132 / 12?' The answer is 11. But using one place precision, it would be 'about 10'.

An alternate definition would be to be accurate to 1 decimal place. What is 'pi'. The answer is 3.14159... However, to only one decimal place it is '3.1'