What are the definitions of 1 lakh, 1 crore, 1 million, and 1 arob in terms of powers of 10?

The image provided is a set of notes on "Large Numbers Around Us," discussing different numbering systems (Indian and International) and concepts related to large numbers. It defines terms like lakh, crore, million, and arob, and mentions topics such as rounding, factorization, and multiplication.

Since there is no specific question asked, I will provide a brief overview of the definitions of large numbers mentioned in the notes.

• a) 1 lakh is 1 followed by 5 zeroes, which is 100,000.
• b) 1 crore is 1 followed by 7 zeroes, which is 10,000,000.
• c) 1 million is 1 followed by 6 zeroes, which is 1,000,000. This is also equivalent to ten lakhs.
• d) 1 arob is 1 followed by 9 zeroes, which is 1,000,000,000. This is also equivalent to 100 crore or 1 billion.