Find Least Common Multiple of 68 and 70 using prime factorisation method.
Answer
LCM( 68, 70 ) = 2380
Explanation
Step 1: Write down factorisation of each number:
68 = 2 · 2 · 17
70 = 2 · 5 · 7
Step 2 : Match primes vertically:
| 68 | = | 2 | · | 2 | · | 17 | ||||
| 70 | = | 2 | · | 5 | · | 7 |
Step 3 : Bring down numbers in each column and multiply to get LCM:
| 68 | = | 2 | · | 2 | · | 17 | ||||||
| 70 | = | 2 | · | 5 | · | 7 | ||||||
| LCM | = | 2 | · | 2 | · | 5 | · | 7 | · | 17 | = | 2380 |
This solution can be visualized using a Venn diagram.
The LCM is equal to the product of all the numbers on the diagram.
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