"how many digits" is correct and usable in written English.
You can use it when asking a specific question related to numbers. For example, "How many digits are in a credit card number?".
They tested all 27 of the subjects' memory abilities using a technique known as digital span, which measures how many digits a person can remember and immediately recall in the correct order.
"How many digits do Daesh [Isis] deserve?
How many digits can you still remember?
(How many digits does the number 125100 have? Two hundred and ten).
Know how many digits of the entire phone number are needed to make a local call.
"When you are building a computer, you are literally saying, This is where a number gets stored, and this is how many digits can fit in that space".
How many more digits will be added?
In every event except the poem and speed numbers (which tests how many random digits you can memorize in five minutes) my best practice scores were approaching the top marks of previous U.S. champions.
Note that your teacher may provide you a specific value to use for these masses, or specify how many significant digits you are required to use.
You may get another number that is close to that, depending on how many significant digits your spreadsheet is set to display.
No one knows for certain how many single-digit millionaires live in Silicon Valley.
