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LCM of 70 and 28

The lcm of 70 and 28 is the smallest positive integer that divides the numbers 70 and 28 without a remainder. Spelled out, it is the least common multiple of 70 and 28. Here you can find the result for 70 and 28, along with a total of three methods for computing it.


140

This Least Common Multiple Calculator is Really Cool! Click To TweetYou should check out our calculator. Not only can it determine the outcome of 70 and 28, but also that of three or more integers including seventy and twenty-eight for example. Keep reading to learn everything about the lcm (70,28) and the terms related to it.

What is the Least Common Multiple of 70 and 28?

If you just want to know what is the least common multiple of 70 and 28, it is 140. Usually, this is written as

lcm(70,28) = 140


The lcm of 70 and 28 can be obtained like this:
  • The multiples of 70 are … , 70, 140, 210, ….
  • The multiples of 28 are …, 112, 140, 168, …
  • The common multiples of 70 and 28 are n x 140, intersecting the two sets above, .
  • In the intersection multiples of 70 ∩ multiples of 28 the least positive element is 140.
  • Therefore, the least common multiple of 70 and 28 is 140.

Taking the above into account you also know how to find all the common multiples of 70 and 28, not just the smallest. In the next section we show you how to calculate the lcm of seventy and twenty-eight by means of two more methods.

How to find the LCM of 70 and 28

The least common multiple of 70 and 28 can be computed by using the greatest common factor aka gcf of 70 and 28. This is the easiest approach:

lcm (70,28) = = 140



Alternatively, the lcm of 70 and 28 can be found using the prime factorization of 70 and 28:
  • The prime factorization of 70 is: 2 x 5 x 7
  • The prime factorization of 28 is: 2 x 2 x 7
  • Eliminate the duplicate factors of the two lists, then multiply them once with the remaining factors of the lists to get lcm(70,70) = 140

In any case, the easiest way to compute the result for two numbers like 70 and 28 is by using our calculator above. Note that it can also compute the lcm of more than two numbers, separated by a comma. For example, enter 70,282,2. Push the button only to start over.

Similar searched terms on our site also include:

In the next paragraph we explain how the mathematical concept can be employed.

Keep reading – it’s really interesting.

Use of Least Common Multiple of 70 and 28

What is the least common multiple of 70 and 28 used for? Answer: It is helpful for adding and subtracting fractions like 1/70 and 1/28. Just multiply the dividends and divisors by 2 and 5, respectively, such that the divisors have the value of 140, the lcm of 70 and 28.

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Next, we shed a light on the mathematical properties.

Properties of LCM of 70 and 28

The most important properties of the lcm(70,28) are:

  • Commutative property: lcm(70,28) = lcm(28,70)
  • Associative property: lcm(70,28,n) = lcm(lcm(28,70),n)

The associativity is particularly useful to get the lcm of three or more numbers; our calculator makes use of it.

Summary

Note that you can find the least common multiple of many integer pairs including seventy / twenty-eight by using the search form in the sidebar of this page.

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– Article written by Mark, last updated on August 8th, 2023