LCM for 15 and 56

"Least Common Multiple" Calculator

Least Common Multiple of

and

What's the Least Common Multiple (LCM) of 15 and 56?

Answer

LCM of 15 and 56 is 840

(Eight hundred forty)

Finding LCM for 15 and 56 using GCF of these numbers

The first method to find LCM for numbers 15 and 56 is to find Greatest Common Factor (GCF) of these numbers. Here's the formula:

LCM = (Number1 × Number2) ÷ GCF

GCF of numbers 15 and 56 is 1, so

LCM = (15 × 56) ÷ 1

LCM = 840 ÷ 1

LCM = 840

Finding LCM for 15 and 56 by Listing Multiples

The second method to find LCM for numbers 15 and 56 is to list out the common multiples for both numbers and pick the first one that matches:

Multiples of 15: 15, 30, 45, 60, 75, 90, 105, 120, 135, 150, 165, 180, 195, 210, 225, 240, 255, 270, 285, 300, 315, 330, 345, 360, 375, 390, 405, 420, 435, 450, 465, 480, 495, 510, 525, 540, 555, 570, 585, 600, 615, 630, 645, 660, 675, 690, 705, 720, 735, 750, 765, 780, 795, 810, 825, 840, 855, 870

Multiples of 56: 56, 112, 168, 224, 280, 336, 392, 448, 504, 560, 616, 672, 728, 784, 840, 896, 952

So the LCM for 15 and 56 is 840

Finding LCM for 15 and 56 by Prime Factorization

Another method to find LCM for numbers 15 and 56 is to list all Prime Factors for both numbers and multiply the highest exponent prime factors:

All Prime Factors of 15: 3, 5 (exponent form: 31, 51)

All Prime Factors of 56: 2, 2, 2, 7 (exponent form: 23, 71)

31 × 51 × 23 × 71 = 840

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About "Least Common Multiple" Calculator

This calculator will help you find the Least Common Multiple (LCM) of two numbers. For example, it can help you find out what's the Least Common Multiple (LCM) of 15 and 56? (The answer is: 840). Select the first number (e.g. '15') and the second number (e.g. '56'). After that hit the 'Calculate' button.
Least Common Multiple (LCM) also known as the Lowest Common Multiple or Smallest Common Multiple of 2 numbers - it is the smallest positive integer that is divisible by both numbers

"Least Common Multiple" Calculator

Least Common Multiple of

and

LCM Table

Number 1Number 2LCM
15656
25656
356168
45656
556280
656168
75656
85656
956504
1056280
1156616
1256168
1356728
145656
1556840
1656112
1756952
1856504
19561064
2056280
2156168
2256616
23561288
2456168
25561400
2656728
27561512
285656
29561624
3056840

FAQ

What's the Least Common Multiple (LCM) of 15 and 56?

LCM of 15 and 56 is 840

How to find the LCM of 15 and 56 using prime factorization?

To find the LCM of 15 and 56, find all prime factors of both numbers, then multiply the highest power of each prime factor. The result is 840.

What is the difference between LCM and GCF?

LCM (Least Common Multiple) is the smallest number divisible by both numbers, while GCF (Greatest Common Factor) is the largest number that divides both. For 15 and 56: LCM = 840, GCF = 1.

See Also