HCF and LCM | Numbers | Maths

The video tutorial, led by Lorenzo, explores the concepts of highest common factors (HCF) and lowest common multiples (LCM). It begins with an introduction to factors and multiples, explaining that factors are numbers that divide another number exactly, while multiples are results of multiplying a number by integers. The tutorial then delves into finding the HCF, using examples like 16 and 24, and explains the process of listing factors and identifying the highest common one. It also covers finding the LCM by listing multiples and identifying the smallest common multiple, using examples like 16 and 24, and 15 and 25. The video concludes with practice exercises for viewers to apply their understanding.

What is a factor of a number?

• A number that is always greater than the original number

• A number that cannot be divided by any other number

• A number that divides another number exactly without leaving a remainder

• A number that is the result of multiplying two numbers

Which of the following is a multiple of 3?

• 7

• 11

• 9

• 5

What is the highest common factor of 16 and 24?

• 4

• 6

• 8

• 12

Which step is NOT involved in finding the LCM of two numbers?

• Identify the highest factor in both lists

• Choose the smallest common multiple

• Find common multiples

• List the multiples of each number

What is the LCM of 15 and 25?

• 50

• 75

• 100

• 125