Practice and memorization. It may help to memorize the digits in sets, like ten at a time. Here are the first 50 digits if you want to work on memorizing them:
3.141592653
5897932384
6264338327
9502884197
1693993751
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4.25
Have a look at the related link - it shows the first million digits !
The first 50 are:3.14159265358979323846264338327950288419716939937510
The first eleven digits of pi are:3.141592653
3.141592653589793238462643383279502884197169399375105820974944592307816406286208998628034825342117067982148086513282316647093844609550582231725359408128481117450284102701938521105559644622948954930381964428810975665933446128475648233786783165271201909145648566923460348610454326648213393607260249141273Broken into chunks of 50.If you wanted to know these for memorisation, there are thousands of results from searching "digits of pi", some of which can display up to the first million digits.