### Theory

 1 Common Factor 2 Common Multiple 3 Prime factorisation 4 Highest common factor 5 Lowest common Multiple 6 Application problems based on LCM and HCF 7 Relationship between the numbers and their HCF and LCM

### Exercises

 1 Find the common factor Difficulty: easy 2 2 Evaluate the highest common factor by prime factor method Difficulty: easy 2 3 Find the prime factors Difficulty: easy 3 4 Find the least number Difficulty: easy 3 5 Evaluate the common multiples Difficulty: medium 4 6 Specify the largest number of groups he can make Difficulty: medium 4 7 Find the largest number of plates can prepare by the boy Difficulty: medium 4 8 Determine the smallest number of books Difficulty: medium 4 9 Evaluate the smallest number of each type of box Difficulty: medium 4 10 Obtain the longest tape which can measure the box Difficulty: medium 4 11 Find the LCM using HCF Difficulty: medium 4 12 Find the other number Difficulty: medium 4 13 Determine the smallest three digit number Difficulty: hard 5 14 What is the greatest length of the rope he can make Difficulty: hard 4 15 When will the buses meet Difficulty: hard 5 16 How many pairs are possible Difficulty: hard 4

### Tests

 1 Training test Difficulty: medium 9 2 Training test Difficulty: medium 11 3 Training test Difficulty: medium 10

### Teacher content

 1 Methodical recommendation