Helping with math

Okay so to add onto the picture if writing makes it easier to understand, if it’s 3 digits it’s hundred. If it’s 4 digits it’s thousands. If it’s 6 digits it’s hundred-thousands. If it’s 7 digits it’s a million. If it’s 9 digits it’s a hundred-millions. If it had 10 digits it’s a billion. If it had 12 digits it’s hundred-billions. Hope this helps when reading long numbers. Oh and after billions it’s trillions plus hundred trillion if it’s 15 digits.