The answer
One million is 1,000,000. Divide by the 10,000,000 units in a crore to get 0.1 crore. The same number is 10 lakhs.
Check a bigger number
7 million ÷ 10 = 0.7 crore. 25 million ÷ 10 = 2.5 crores. You can check the second answer by multiplying 2.5 by 10,000,000.
Avoid a common zero error
A lakh is one tenth of a million, while a crore is ten million. Write 100,000, 1,000,000 and 10,000,000 in a row before converting if the names are unfamiliar.