Class 7 Computational Thinking & AI
Official CBSE Student Handbook curriculum with 240 interactive practice questions, algorithmic thinking puzzles, visual reasoning diagrams, and ethical AI case studies.
Large Numbers Around Us
Large Numbers Around Us develops algorithmic decomposition and constraint-based problem solving by exploring multi-digit number properties, place values, and cryptarithmetic puzzles.
Practice Questions (20)
Click an option to test your answerA factory produces 12,50,000 widgets per month. How many widgets does it produce in a full year?
Hint: Multiply 12,50,000 by 12. Group the answer in Indian place-value notation (lakhs and crores).
The distance from Earth to the Moon is approximately 3,84,400 km. Express this in metres.
Hint: 1 km = 1,000 m. Multiply the distance in km by 1,000 and re-read the place values.
Using digits 3, 5, 7, 0, 2 (each exactly once), form the LARGEST possible 5-digit number where the ten-thousands digit is odd.
Hint: The leftmost digit must be odd. Pick the largest odd digit available, then place the rest in descending order.
India's population in 2023 was approximately 1,42,86,72,000. What is this number rounded to the nearest crore?
Hint: Identify the crore digit. Check the lakh digits: if >= 50 lakh, round up the crore.
A number has 8 in the crores place, 0 in all other places. Which of these represents it?
Hint: In Indian place-value: ones, tens, hundreds, thousands, ten-thousands, lakhs, ten-lakhs (ten-million), crores.
Find the difference between the place value and face value of digit 6 in the number 56,32,748.
Hint: Face value is the digit itself. Place value = digit x its positional value. Subtract face value from place value.
How many lakhs make one billion?
Hint: 1 billion = 10^9. 1 lakh = 10^5. Divide: 10^9 / 10^5 = 10^4 = 10,000.
A 7-digit number has 4 in the ten-lakhs place, 2 in the lakhs place, 0 in all other places. What is the number?
Hint: Ten-lakhs = 10^6, lakhs = 10^5. Add the contributions: 4x10^6 + 2x10^5 = 42,00,000.
Arrange in ascending order: 9,08,725; 90,08,725; 9,80,725; 90,87,025.
Hint: Compare number of digits first. For equal-digit numbers, compare digit-by-digit from left to right.
The sum of two numbers is 1,25,00,000. One number is 75,50,000. What is the other number?
Hint: Subtract the known number from the total sum.
A 6-digit number has the form ABCDEF where each letter is a distinct digit from 1 to 6. If A > B > C and D < E < F, and the sum A + B + C = D + E + F = 11, which of the following is a possible value for the number?
Hint: Check the constraints: A > B > C and D < E < F with matching sum constraints.
In the Indian place value system, how many periods are there in a 9-digit number?
Hint: The periods are: Ones, Thousands, Lakhs, and Crores.
How many 5-digit numbers have the property that the product of their digits is 0?
Hint: Total 5-digit numbers minus 5-digit numbers with no zero digit (9 × 9 × 9 × 9 × 9).
If 1 Million = 10 Lakhs and 1 Billion = 100 Crores, how many Millions are equal to 2.5 Billions?
Hint: 1 Billion = 10⁹ and 1 Million = 10⁶. 1 Billion = 1,000 Millions.
A digital lock requires a 4-digit code. The code is an even number, the thousands digit is a prime number greater than 5, the hundreds digit is a perfect square, and the tens digit is 0. What is the code if all digits are distinct?
Hint: Thousands digit must be 7 (the only single-digit prime > 5).
Arrange the following numbers in descending order: P = 4 Crores 50 Lakhs Q = 45 Millions R = 405 Lakhs S = 4,500 Thousands
Hint: 1 Crore = 100 Lakhs, 1 Million = 10 Lakhs, 1 Thousand = 0.01 Lakh.
What is the smallest 7-digit number that can be formed using each of the digits 8, 0, 3, 5, 2, 9, 1 exactly once?
Hint: A 7-digit number cannot start with 0. Place the smallest non-zero digit first, then 0, then ascending.
In a cryptarithmetic puzzle: SEND + MORE = MONEY, what digit does 'M' represent?
Hint: The sum of two 4-digit numbers cannot exceed 19,998, so the leading digit of a 5-digit sum is always 1.
Rounding off 74,85,632 to the nearest Ten Thousands gives:
Hint: Look at the thousands digit (5). If it is 5 or more, round up the ten thousands digit.
A library has 12,45,600 books. If 3,78,950 books are issued and 1,24,300 new books are added, how many books are currently in the library?
Hint: Subtract the issued books from the initial count, then add the new arrivals.
Join the CT & AI Learning Community
Get new worksheets, quizzes, activities and AI learning resources on WhatsApp.
