What is the LCM of 7 and 8?

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23
Mark C. Share
Oct 4, 2017

56

Explanation:

It just means find the first number that appears in both the 7 and the 8 times tables.

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11
Oct 4, 2017

The LCM of $7$ and $8$ is $56$.

Explanation:

Well, the multiples of $7$ are

$7 , 14 , 21 , 28 , 35 , 42 , 49 , \underline{56}$

and the multiples of $8$ are

$8 , 16 , 24 , 32 , 40 , 48 , \underline{56}$

So you check your multiples and find your LCM by finding the numbers that match and whichever number is smaller and matches, that is your answer!

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4
Dec 3, 2017

$7 \times 8 = 56$

Explanation:

7 and 8 are consecutive numbers so their lcm is their product.

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sjc Share
Oct 7, 2017

$\lcm \left(7 , 8\right) = 56$

Explanation:

another use the formula

if $a , b \text{ }$are two numbers

$a b = h c f \left(a , b\right) \times \lcm \left(a , b\right)$

$7 \times 8 = h c f \left(7 , 8\right) \times \lcm \left(a , b\right)$

$56 = 1 \times \lcm \left(a , b\right)$

$\therefore \lcm \left(7 , 8\right) = 56$

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