Feedback form
Hi! What do you think?

Drag it here or paste with Ctrl+V

    You can also email us on infocalculat.io

    LCM for 5, 8 and 20

    "Least Common Multiple of 3 Numbers" Calculator
    Least Common Multiple of
    ,
    and

    What's the Least Common Multiple (LCM) of 5, 8 and 20?

    Answer

    LCM of 5, 8 and 20 is
    40

    (Forty)

    40 is the smallest positive integer that 5, 8 and 20 all divide without a remainder — every other common multiple of the three is a multiple of it.

    Finding the LCM of 5, 8 and 20 by Prime Factorization

    Split all three numbers into prime factors, then take every prime that shows up in at least one of them, each raised to the highest power it reaches there. Multiplying those highest powers gives the least common multiple:

    All Prime Factors of 5: 5 (exponent form: 5)

    All Prime Factors of 8: 2 × 2 × 2 (exponent form: 23)

    All Prime Factors of 20: 2 × 2 × 5 (exponent form: 22 × 5)

    Prime factor5820Highest power
    2—232223
    55—55

    LCM = 23 × 5 = 40

    Checking the LCM of 5, 8 and 20 Two Numbers at a Time

    The least common multiple is associative, so three numbers can be handled as two pairs: first the LCM of the first two, then the LCM of that value and the third. Each pair goes through the two-number formula, which uses the greatest common divisor:

    LCM(a, b) = (a × b) ÷ GCD(a, b)

    LCM(5, 8) = (5 × 8) ÷ 1 = 40 ÷ 1 = 40

    LCM(40, 20) = (40 × 20) ÷ 20 = 800 ÷ 20 = 40

    LCM(5, 8, 20) = 40

    The pairs may be taken in any order — 8 and 20 first, then 5 — and the answer is the same 40. That is exactly why the two routes on this page agree.

    Related Calculations

    See Also

    Share This Calculation
    Print
    https://calculat.io/en/number/least-common-multiple-lcm-of-3-numbers/5--8--20Copy
    <a href="https://calculat.io/en/number/least-common-multiple-lcm-of-3-numbers/5--8--20">What is the LCM of 5, 8 and 20? - Calculatio</a>Copy
    Facebook
    Twitter
    Telegram
    WhatsApp
    Viber
    Email
    What is the LCM of 5, 8 and 20?. The LCM of 5, 8 and 20 is 40 — the smallest number all three divide with no remainder. Step-by-step solution for three numbers.
    https://calculat.io/en/number/least-common-multiple-lcm-of-3-numbers/5--8--20/generated.jpgCopy

    LCM Table

    Number 1Number 2Number 3LCM
    55840
    568120
    578280
    58840
    589360
    581040
    5811440
    5812120
    5813520
    5814280
    5815120
    581680
    5817680
    5818360
    5819760
    582040
    5821840
    5822440
    5823920
    5824120
    5825200
    5826520
    58271,080
    5828280
    58291,160
    5830120
    58311,240
    5832160
    58331,320
    5834680

    About "Least Common Multiple of 3 Numbers" Calculator

    This calculator finds the Least Common Multiple (LCM) of three numbers at once, without doing it in two passes. For example, it can help you find out what's the Least Common Multiple (LCM) of 5, 8 and 20? (The answer is: 40). Enter the first number (e.g. '5'), the second (e.g. '8') and the third (e.g. '20'), then hit the 'Calculate' button.
    The Least Common Multiple of three numbers is the smallest positive integer that all three of them divide without a remainder
    "Least Common Multiple of 3 Numbers" Calculator
    Least Common Multiple of
    ,
    and

    FAQ

    What's the Least Common Multiple (LCM) of 5, 8 and 20?

    LCM of 5, 8 and 20 is 40

    How to find the LCM of 5, 8 and 20 by prime factorization?

    Take every prime that appears in 5, 8 and 20 to the highest power it reaches in any one of them and multiply: 2³ × 5 = 40.

    Can you get the LCM of 5, 8 and 20 two numbers at a time?

    Yes, and it is the check this page prints. The LCM of 5 and 8 is 40, and the LCM of 40 and 20 is 40 — the same answer, because the least common multiple is associative and does not depend on the order of the three numbers.

    Is 40 divisible by 5, 8 and 20?

    Yes, and by definition it is the smallest positive integer that is: 40 ÷ 5, 40 ÷ 8 and 40 ÷ 20 all come out whole. Any other common multiple of 5, 8 and 20 is a multiple of 40.

    See Also