The Highest Common Factor © T Madas

What are the factors of 45? 45 1 3 5 9 15 45 What are the factors of 36? 36 1 2 3 4 6 6 9 12 18 36 © T Madas

What are the common factors of 45 and 36? 1 3 5 9 15 45 36 1 2 3 4 6 6 9 12 18 36 © T Madas

What is the highest common factor of 45 and 36? 1 3 5 9 15 45 H.C.F. 36 1 2 3 4 6 6 9 12 18 36 © T Madas

What are the factors of 28? 28 1 2 4 7 14 28 What are the factors of 42? 42 1 2 3 6 7 14 21 42 © T Madas

What are the common factors of 28 and 42? 1 2 4 7 14 28 42 1 2 3 6 7 14 21 42 © T Madas

What is the highest common factor of 28 and 42? 1 2 4 7 14 28 42 1 2 3 6 7 14 21 42 The H.C.F of 28 and 42 is 14 © T Madas

What is the highest common factor of 24 and 54? 1 2 3 4 6 8 12 24 54 1 2 3 6 9 18 27 54 The H.C.F of 24 and 54 is 6 © T Madas

What is the highest common factor of 60 and 72? 1 2 3 4 5 6 10 12 15 20 30 60 72 1 2 3 4 6 8 9 12 18 24 36 72 The H.C.F of 60 and 72 is 12 © T Madas

Class-work Find the Highest Common Factor of these sets of numbers: 6 and 9 8 and 12 12 and 15 12 and 20 12 and 18 20 and 24 18 and 24 18 and 30 18 and 36 20 and 32 28 and 42 20 and 64 © T Madas

© T Madas