One number, two naming systems
1 crore = 10,000,000 = 10 million. A million contains six zeros; a crore contains seven.
A worked example
To convert 3.2 crores into millions, multiply 3.2 by 10. The result is 32 million. To go back from millions to crores, divide by 10: 45 million = 4.5 crores.
Names do not convert currencies
This calculation changes the scale used to describe a number. It does not turn one currency into another. If a figure is in rupees, it remains in rupees after converting crores to millions.