Finding HCF and LCM Using Ladder Method

This tutorial explains how to find the highest common factor (HCF) and lowest common multiple (LCM) using the ladder method. The method involves writing the numbers at the top, drawing an L-shape, and identifying the lowest prime factors. Two examples are provided: one with numbers 24 and 36, and a more complex one with numbers 800 and 104. The tutorial demonstrates how to multiply the prime factors to find the LCM and HCF.

What is the primary focus of this tutorial?

• Learning about algebraic expressions

• Understanding geometric shapes

• Calculating the highest common factor and lowest common multiple

• Finding the square root of numbers

Which method is used in this tutorial to find HCF and LCM?

• The division method

• The ladder method

• The subtraction method

• The multiplication method

In the first example, what are the two numbers used?

• 12 and 18

• 30 and 45

• 24 and 36

• 40 and 60

What is the first step in the ladder method?

• Draw a circle around the numbers

• Subtract the smaller number from the larger one

• Write the numbers at the top and draw an L-shape

• Multiply the numbers together

What is the lowest prime factor of both 24 and 36?

• 2

• 5

• 7

• 3

How is the LCM found using the ladder method?

• By subtracting the smallest number

• By multiplying all the prime numbers around the edge

• By adding all the numbers

• By dividing the largest number

What is the LCM of 24 and 36?

• 48

• 60

• 72

• 84

How is the HCF found in the ladder method?

• By subtracting the numbers on the side

• By dividing the numbers on the side

• By multiplying the numbers on the side

• By adding the numbers on the side

What is the HCF of 24 and 36?

• 6

• 8

• 12

• 10

What are the numbers used in the second example?

• 1000 and 104

• 700 and 104

• 800 and 104

• 900 and 104