Finding the Least Common Multiple

The video introduces a quick method to find the least common multiple (LCM) of numbers, a concept taught from class five and used in various exams. The teacher demonstrates the method with several examples, emphasizing choosing the greatest number and dividing it by others, multiplying if necessary. The video concludes with encouragement to practice for efficiency.

What is the primary focus of the video tutorial?

• Finding the greatest common divisor

• Learning a trick to calculate LCM quickly

• Understanding prime factorization

• Solving quadratic equations

In the example with numbers 6, 4, and 12, what is the first step to find the LCM?

• Multiply all the numbers

• Find the prime factors

• Add all the numbers

• Choose the greatest number

Why is 12 the LCM of the numbers 6, 4, and 12?

• Because 12 is a prime number

• Because 12 is the sum of 6 and 4

• Because 12 is divisible by both 6 and 4

• Because 12 is the smallest number

In the example with numbers 5, 30, and 50, what is the LCM?

• 50

• 5

• 30

• 15

What is the LCM of numbers 3 and 1?

• 1

• 3

• 4

• 6

In the example with numbers 12, 6, and 4, what is the next step if the greatest number is not divisible by all others?

• Add 1 to the greatest number

• Multiply the greatest number by 2

• Subtract 1 from the greatest number

• Divide the greatest number by 2

What is the LCM of numbers 12, 6, and 4 after multiplying by 2?

• 18

• 24

• 36

• 48

In the example with numbers 8, 24, 6, and 5, what is the LCM after multiplying by 5?

• 96

• 72

• 40

• 120

Why can't 5 divide 40 in the example with numbers 8, 24, 6, and 5?

• Because 40 is not a multiple of 5

• Because 40 is a prime number

• Because 40 is less than 5

• Because 40 is an even number

What is the LCM of numbers 2, 3, and 14 after multiplying by 3?

• 28

• 56

• 84

• 42