What is the LCM of 15 and 18?

This Math problem belongs to the Pre-Algebra category. Use our LCM Calculator to solve similar problems with step-by-step solutions.

Problem

$$ \operatorname{lcm}(15, 18) $$

Solution

$$90$$

Steps

Step 1

Factor the expressions that are not already factored.
$$15=3\times 5$$ $$18=2\times 3^{2}$$

Step 2

Identify all the factors and their highest power in all expressions. Multiply the highest powers of these factors to get the least common multiple.
$$2\times 3^{2}\times 5$$

Step 3

Expand the expression.
$$90$$
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