Playing with Numbers Elicit Warm-up Help the rabbit reach the carrot! Look at the picture on the right. Help the rabbit by solving the problems given below. Rule: The rabbit can take one step forward every time it gives the correct answer. 1. 4 × 100 + 7 × 10 + 3 × 1 = 2. 10 less than 10 times 51 = 3. 5 × 10,000 + 9 × 10 + 1 × 1= 4. 36,000 + 400 - 100 + 10 = The problems given above involved more than one operation. 1. How did you get the answers without using a place value chart? 2. Which operation did you carry out first? My teacher told us to solve a problem that involves more than one operations. I am not able to do it. I need help to understand which operation to perform first. Learning Objectives In this chapter, you will learn about: • Simplification of brackets- BODMAS rule • Multiples and factors • Types of numbers • Prime factorisation- division and factor tree method • Prime triplets • Divisibility rules • Least common multiple (LCM) and highest common factor (HCF) • Prime Factorisation and Division Method for LCM and HCF • The property: LCM × HCF = Product of two numbers 16 

Chapter Review FLUENCY MULTIPLE CHOICE QUESTIONS 1-3 1. The simplified form of 14 + 8x4 + 194 ÷ 7 is: a. 84 c. 90 d. 62 2. The smallest factor of every number is: a. 2 b. 4 C. 0 1 3. The number 2 is the smallest prime number and is: a. prime b. odd c. twin prime even 4. The HCF of the coprime numbers 4 and 15 is: a. O C. 2 d. finite 5. Which of the following numbers is divisible by 3? a. 73 b. 137 54 d. 277 6....... is a perfect number. a. 469 b. 459 496 d. 495 7. 56892341 is divisible by: a. 9 b. 10 C. 11 d. 12 8. If P is the 8th prime number and Q is the 12th prime number, then Q - P is: a. 30 b. 28 18 d. 14 9. A number is always divisible by 90, if: a. it is divisible by both 7 and 45. b. it is divisible by both 8 and 18. c. it is divisible by both 9 and 11. None of these 10. What is the least digit that can be replaced with '#' ', so that the number 90##53 is divisible by 11? a. 3 

[… truncated for preview]