Usage patterns
〈物〉に数字を使うto use digits in ~ (e.g. a password)
Please use digits in your password.
数字が伸びるfor figures/numbers to grow (e.g. sales)
This month's sales figures grew.
数字を出すto produce or present figures/results
We need to present concrete figures at the meeting.
数字に強い/弱いto be good/bad at handling numbers
He's good with numbers, so he's in charge of accounting.
数字で示すto indicate or express something in numbers
We're being asked to demonstrate the effect with numbers.