WHAT IS THE LCM OF 1001010101010101010101010101010101000 AND 5555555
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Step-by-step explanation:
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The Least Common Multiple (LCM) is also referred to as the Lowest Common Multiple (LCM) and Least Common Divisor (LCD). For two integers a and b, denoted LCM(a,b), the LCM is the smallest positive integer that is evenly divisible by both a and b. For example, LCM(2,3) = 6 and LCM(6,10) = 30.
The LCM of two or more numbers is the smallest number that is evenly divisible by all numbers in the set.
Least Common Multiple Calculator
Find the LCM of a set of numbers with this calculator which also shows the steps and how to do the work.
Input the numbers you want to find the LCM for. You can use commas or spaces to separate your numbers. But do not use commas within your numbers. For example, enter 2500, 1000 and not 2,500, 1,000.
How to Find the Least Common Multiple LCM
This LCM calculator with steps finds the LCM and shows the work using 5 different methods:
Listing Multiples
Prime Factorization
Cake/Ladder Method
Division Method
Using the Greatest Common Factor GCF
How to Find LCM by Listing Multiples
List the multiples of each number until at least one of the multiples appears on all lists
Find the smallest number that is on all of the lists
This number is the LCM
Example: LCM(6,7,21)
Multiples of 6: 6, 12, 18, 24, 30, 36, 42, 48, 54, 60
Multiples of 7: 7, 14, 21, 28, 35, 42, 56, 63
Multiples of 21: 21, 42, 63
Find the smallest number that is on all of the lists. We have it in bold above.
So LCM(6, 7, 21) is 42
How to find LCM by Prime Factorization
Find all the prime factors of each given number.
List all the prime numbers found, as many times as they occur most often for any one given number.
Multiply the list of prime factors together to find the LCM.
The LCM(a,b) is calculated by finding the prime factorization of both a and b. Use the same process for the LCM of more than 2 numbers.
For example, for LCM(12,30) we find:
Prime factorization of 12 = 2 × 2 × 3
Prime factorization of 30 = 2 × 3 × 5
Using all prime numbers found as often as each occurs most often we take 2 × 2 × 3 × 5 = 60
Therefore LCM(12,30) = 60.
For example, for LCM(24,300) we find:
Prime factorization of 24 = 2 × 2 × 2 × 3
Prime factorization of 300 = 2 × 2 × 3 × 5 × 5
Using all prime numbers found as often as each occurs most often we take 2 × 2 × 2 × 3 × 5 × 5 = 600
Therefore LCM(24,300) = 600.
How to find LCM by Prime Factorization using Exponents
Find all the prime factors of each given number and write them in exponent form.
List all the prime numbers found, using the highest exponent found for each.
Multiply the list of prime factors with exponents together to find the LCM.
Example: LCM(12,18,30)
Prime factors of 12 = 2 × 2 × 3 = 22 × 31
Prime factors of 18 = 2 × 3 × 3 = 21 × 32
Prime factors of 30 = 2 × 3 × 5 = 21 × 31 × 51
List all the prime numbers found, as many times as they occur most often for any one given number and multiply them together to find the LCM
2 × 2 × 3 × 3 × 5 = 180
Using exponents instead, multiply together each of the prime numbers with the highest power
22 × 32 × 51 = 180
So LCM(12,18,30) = 180
Example: LCM(24,300)
Prime factors of 24 = 2 × 2 × 2 × 3 = 23 × 31
Prime factors of 300 = 2 × 2 × 3 × 5 × 5 = 22 × 31 × 52
List all the prime numbers found, as many times as they occur most often for any one given number and multiply them together to find the LCM
2 × 2 × 2 × 3 × 5 × 5 = 600
Using exponents instead, multiply together each of the prime numbers with the highest power
23 × 31 × 52 = 600
So LCM(24,300) = 600
How to Find LCM Using the Cake Method (Ladder Method)
The cake method uses division to find the LCM of a set of numbers. People use the cake or ladder method as the fastest and easiest way to find the LCM because it is simple division.
The cake method is the same as the ladder method, the box method, the factor box method and the grid method of shortcuts to find the LCM. The boxes and grids might look a little different, but they all use division by primes to find LCM.
Find the LCM(10, 12, 15, 75)
Write down your numbers in a cake layer (row)
Cake / Ladder
10 12 15 75
Divide the layer numbers by a prime number that is evenly divisible into two or more numbers in the layer and bring down the result into the next layer.
Cake / Ladder
2 10 12 15 75
5 6
Answer:
97494848485
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