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What is the least common multiple of 21 and 35?
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28 May 2022, 01:00
28 May 2022, 01:00
Expert Reply
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Question Stats:
80% (00:21) correct
20% (00:52) wrong based on 10 sessions
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What is the least common multiple of 21 and 35?
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105
Part of the project: GRE QCQ & PS 3 Questions Every One DAILY Challenge - (2022)
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GRE Math Essentials for a TOP Quant Score - Q170!!! (2021)
GRE Geometry Formulas for a Q170
GRE - Math Book
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
GRE Math Essentials for a TOP Quant Score - Q170!!! (2021)
GRE Geometry Formulas for a Q170
GRE - Math Book
Re: What is the least common multiple of 21 and 35?
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28 May 2022, 08:28
28 May 2022, 08:28
1
Prime factorizaton for 21 and 35 are 3,7 and 5,7 respectively
Therefore LCM is 3*5*7=105
Answer is (105)
Therefore LCM is 3*5*7=105
Answer is (105)
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Re: What is the least common multiple of 21 and 35?
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27 Oct 2022, 10:07
27 Oct 2022, 10:07
We need to find LCM of 21 and 35
Lets find it using two methods
Method 1:
21 = 3*7 = \(3^1 * 7^1\)
35 = 5*7 = \(5^1 * 7^1\)
To find the LCM take all the terms and take their highest power in all of the above.
=> LCM(21, 35) = \(3^1 * 5^1 * 7^1\) = 105
So, Answer will be 105
Method 2:
7 | 21, 35
-----------------
| 3, 5
=> LCM (21, 35) = 7 * 3 * 5 = 105
So, Answer will be 105
Hope it helps!
To learn more about LCM and GCD watch the following videos
Lets find it using two methods
Method 1:
21 = 3*7 = \(3^1 * 7^1\)
35 = 5*7 = \(5^1 * 7^1\)
To find the LCM take all the terms and take their highest power in all of the above.
=> LCM(21, 35) = \(3^1 * 5^1 * 7^1\) = 105
So, Answer will be 105
Method 2:
7 | 21, 35
-----------------
| 3, 5
=> LCM (21, 35) = 7 * 3 * 5 = 105
So, Answer will be 105
Hope it helps!
To learn more about LCM and GCD watch the following videos
