Find the LCM 30 72 120

$30$ $72$ $120$

Step 1

The LCM is the smallest positive number that all of the numbers divide into evenly.

1. List the prime factors of each number.

2. Multiply each factor the greatest number of times it occurs in either number.

Step 2

The prime factors for $30$ are $2 \cdot 3 \cdot 5$ .

$30$ has factors of $2$ and $15$ .

$2 \cdot 15$

$15$ has factors of $3$ and $5$ .

$2 \cdot 3 \cdot 5$

Step 3

The prime factors for $72$ are $2 \cdot 2 \cdot 2 \cdot 3 \cdot 3$ .

$72$ has factors of $2$ and $36$ .

$2 \cdot 36$

$36$ has factors of $2$ and $18$ .

$2 \cdot 2 \cdot 18$

$18$ has factors of $2$ and $9$ .

$2 \cdot 2 \cdot 2 \cdot 9$

$9$ has factors of $3$ and $3$ .

$2 \cdot 2 \cdot 2 \cdot 3 \cdot 3$

Step 4

The prime factors for $120$ are $2 \cdot 2 \cdot 2 \cdot 3 \cdot 5$ .

$120$ has factors of $2$ and $60$ .

$2 \cdot 60$

$60$ has factors of $2$ and $30$ .

$2 \cdot 2 \cdot 30$

$30$ has factors of $2$ and $15$ .

$2 \cdot 2 \cdot 2 \cdot 15$

$15$ has factors of $3$ and $5$ .

$2 \cdot 2 \cdot 2 \cdot 3 \cdot 5$

Step 5

The LCM of $30, 72, 120$ is the result of multiplying all prime factors the greatest number of times they occur in either number.

$2 \cdot 2 \cdot 2 \cdot 3 \cdot 3 \cdot 5$

Step 6

Multiply $2 \cdot 2 \cdot 2 \cdot 3 \cdot 3 \cdot 5$ .

Multiply $2$ by $2$ .

$4 \cdot 2 \cdot 3 \cdot 3 \cdot 5$

Multiply $4$ by $2$ .

$8 \cdot 3 \cdot 3 \cdot 5$

Multiply $8$ by $3$ .

$24 \cdot 3 \cdot 5$

Multiply $24$ by $3$ .

$72 \cdot 5$

Multiply $72$ by $5$ .

$360$

Find the LCM 30 72 120

Related Questions

Support LCMGCF.com by disabling your adblocker.