NCERT MCQ Solutions for Class 7 Maths Ganita Prakash Chapter 1 Large Numbers Around Us

One lakh is equal to 1 followed by five zeroes, which is 1,00,000. It is the smallest six-digit number in the Indian place value system and is widely used in counting large quantities in India and neighboring countries.

The Indian number system is used in South Asian countries like Nepal and Bangladesh. The United States uses the International or American number system which groups digits in threes from the right using million and billion.

In the Indian place value system, 15,75,000 is read as fifteen lakh seventy five thousand. The commas separate the digits as per the 2-2-3 pattern used in the Indian system of numbering.

One crore is equal to 1 followed by seven zeroes, written as 1,00,00,000 in the Indian number system. It is one hundred times a lakh and is a common large number in Indian usage.

The Ahmedabad cricket stadium has a seating capacity of more than one lakh. This example is used to illustrate how large numbers can still represent physically small spaces.

3,00,600 is written in the Indian number system as three lakh six hundred. The placement of commas helps identify place values like thousands and lakhs for easier reading and understanding.

Since one hundred is 100 and one lakh is 1,00,000, we divide 1,00,000 by 100 to get 1000. Therefore, 1000 hundreds make up one lakh in the Indian number system.

The smallest 6-digit number is 1,00,000. This number comes after the largest 5-digit number which is 99,999. This is the first point where the digit count moves from five to six.

999 is the largest 3-digit number. It is one less than the smallest 4-digit number which is 1000. This fact is useful when identifying digit limits in place value systems.

Dividing 10,50,00,000 by 700 gives an estimate of the weight of an adult blue whale in kilograms. This example helps illustrate large numbers in context of real-world facts.

To reach 1,00,000 using the +1000 button, we must press it 1000 times because 1000 × 1000 = 1,00,000. This helps students relate operations to quantity and number value.

In the American number system, 1,00,00,000 is written as 10,000,000 and called ten million. This comparison helps students understand different international systems of naming and grouping large numbers.

When rounding 6,72,85,183 to the nearest crore, we get 7,00,00,000. This is done by checking the digit in the ten lakh place to decide whether to round up or down.

The exact sum of 4,63,128 and 4,19,682 is 8,83,128. The chapter uses this to illustrate estimation techniques and to understand rounding of large numbers in addition.

Creative Chitti’s calculator uses +10 thirty two times and then +1 once to form 321. This highlights different ways to construct numbers using breakdowns into simpler components.

1,00,00,00,000 is called one arab in the Indian number system. It is equal to 100 crores. This helps students understand very large numbers used in Indian administrative and business contexts.

A billion has nine zeroes and is written as 1,000,000,000 in the American number system. This number is commonly used in global statistics and finance contexts.

The population increased from 75,000 in 2011 to 1,06,000 in 2024. The difference is 31,000. This data is used to help students work with real-world large number comparisons.

The distance between Earth and Sun is estimated by calculating 2100 × 70,000 = 1,47,00,000 km, which is approximately 14 crore km. This shows how multiplication of large numbers provides real-world insights.

One lakh people standing shoulder to shoulder would stretch about 38 kilometers. This visualization helps in understanding the scale of large numbers through real-life analogies.