Question

Find the LCM of 105, 175, 140

Answer 1

Step-by-step explanation:

The instructions to find the LCM of 105, 140 and 175 are the next:

1. Decompose all numbers into prime factors

105 3 35 5 7 7 1 140 2 70 2 35 5 7 7 1 175 5 35 5 7 7 1

2. Write all numbers as the product of its prime factors

Prime factors of 105 = 3 . 5 . 7

Prime factors of 140 = 22 . 5 . 7

Prime factors of 175 = 52 . 7

3. Choose the common and uncommon prime factors with the greatest exponent

Common prime factors: 5 , 7

Common prime factors with the greatest exponent: 52, 71

Uncommon prime factors: 3 , 2

Uncommon prime factors with the greatest exponent: 31, 22

4. Calculate the Least Common Multiple or LCM

Remember, to find the LCM of several numbers you must multiply the common and uncommon prime factors with the greatest exponent of those numbers.

LCM = 52. 71. 31. 22 = 2100

Answer 2

hey your answer is :-

5. | 105, 175, 140

5 ¦ 21, 35, 20

7. ¦ 21, 7, 4

¦ 3. , 1 , 4

So, 5×5×7 × 3 × 1 × 4 = 2100..

So, the LCM is 2100

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