How do you know if your child has discalcic?

Well I’m not super familiar with it but it seems like my inability to accurately translate the number of zeros in a number like reading 1000 as 100 is a sign, trouble with basic operations like times tables is a sign, inverting numbers like reading 23 as 32 is a sign, and not being able to read analog clocks at all even to this day (I’m 24) is a sign. Also, I never did this, but many children apparently start marking numbers with dots to better recognize them