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\ 19-Nov-2025 Bharat Arora Proof-9 Reader’s Sign _______________________ Date __________

7. Multiply using the lattice method.
a. 18 × 23 b. 23 × 25 c. 32 × 45

8. divide and check your answer.
a. 24836 ÷ 8 b. 56436 ÷ 63 c. 94000 ÷ 36
d. 87306 ÷ 203 e. 55000 ÷ 145 f. 51000 ÷ 75

9. What must be added to 756483 to get 997368?

10. Find the sum of 436468 and the difference of 726493 and 543640.

11. The cost of a mobile phone is `8,950. Find the cost of 72 such mobile phones.

12. What is the product of the greatest 4-digit number and the greatest 3-digit number?

13. A traveller covered a distance of 43400 km in 175 days. If he covered the same
distance every day, how much distance did he cover each day?

14. Saumya loves to read storybooks. She reads 36 pages on the first day, 48 pages
on the second day and 90 pages on the third day. If she wants to read an equal
number of pages each day during three days, how many pages should she read
per day?

15. Simplify using the dMAS rule.

a. 280 + 153 ÷ 17 – 8 × 19 = _____

b. 7619 + 832 × 48 ÷ 16 – 8 = _____
16. observe how the multiplier, multiplicand and product change in parts a. and b.,
then use the pattern to predict the answers for the other parts.

a. 24 × 44 = 1056 b. 12 × 22 = 264 c. 24 × 22 = __________
d. 12 × 44 = __________ e. 6 × 22 = __________ f. 6 × 11 = __________

Mental Maths

Choose the correct option. 21 st
Century #Critical Thinking
Skills
1. 3 lakhs + 16 ten thousands =

a. 3 lakhs + 16 lakhs b. 3 lakhs + 7 ten thousands
c. 4 lakhs + 6 ten thousands d. 30 lakhs + 6 ten thousands

2. The sum of the smallest 4-digit, 5-digit and 6-digit numbers is:
a. 1100000 b. 100000 c. 110000 d. 111000

3. (60 + 40) × 300 = ?
a. 10300 b. 30000 c. 30100 d. 100300

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Mathematical Operations