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.

The number <math><mstyle displaystyle="true"><mn>1</mn></mstyle></math> is not a prime number because it only has one positive factor, which is itself.

Not prime

The LCM of <math><mstyle displaystyle="true"><mn>1</mn><mo>,</mo><mn>1</mn></mstyle></math> is the result of multiplying all prime factors the greatest number of times they occur in either number.

The factor for <math><mstyle displaystyle="true"><mi>b</mi><mo>+</mo><mn>8</mn></mstyle></math> is <math><mstyle displaystyle="true"><mi>b</mi><mo>+</mo><mn>8</mn></mstyle></math> itself.

The factor for <math><mstyle displaystyle="true"><mn>7</mn><mi>b</mi><mo>-</mo><mn>3</mn></mstyle></math> is <math><mstyle displaystyle="true"><mn>7</mn><mi>b</mi><mo>-</mo><mn>3</mn></mstyle></math> itself.

The LCM of <math><mstyle displaystyle="true"><mi>b</mi><mo>+</mo><mn>8</mn><mo>,</mo><mn>7</mn><mi>b</mi><mo>-</mo><mn>3</mn></mstyle></math> is the result of multiplying all factors the greatest number of times they occur in either term.

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