Question

3. using Divison method , find the LCM of :
(iii) 44, 72 and 80​

Answer 1

Answer:

Step 1: Write the given numbers in a horizontal line, separating them by commas.

Step 2: Divide them by a suitable prime number, which exactly divides at least two of the given numbers.

Step 3: We put the quotient directly under the numbers in the next row. If the number is not divided exactly, we bring it down in the next row.

Step 4: We continue the process of step 2 and step 3 until all co-prime numbers are left in the last row.

Step 5: We multiply all the prime numbers by which we have divided and the co-prime numbers left in the last row. This product is the least common multiple of the given numbers.

For example:

1. Find least common multiple (L.C.M) of 20 and 30 by division method.

Solution:

least common multiple (L.C.M) of 20 and 30

Least common multiple (L.C.M) of 20 and 30 = 2 × 2 × 5 × 3 = 60.

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Answer 2

Step-by-step explanation:

2) 44,72,80

2 ) 22,36,40

2 )11,18,20

11,9,10

=2×2×2×9×10×11

=7920

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