Question

LCM by division method 21, 28

Answer 1

Answer:

84!!!!!!!!!!!!!!!!!!!

Answer 2

Answer:

$\Large\boxed{84}$

Step-by-step explanation:

Given:

21, and 28 (Find the least common multiple (LCM.))

To solve this problem, first you have to find the LCM of 21, and 28.

Solutions:

First, you have to find the factors of 21 and 28.

Factors of 21:

$\displaystyle 1, 3, 7, 21$

Factors of 28:

$\displaystyle 1, 2, 4, 7, 14, 28$

Next, find the prime factors of 21.

Multiply numbers from left to right.

$\displaystyle 7*3=21$

Then, you have to find the prime factors of 28.

Multiply.

$\displaystyle 7*2*2=28$

Solve.

Multiply the numbers from left to right.

$\displaystyle 2*2*7*3=\boxed{84}$

The LCM (least common multiples) of 21 and 28 is 84.