Subtracting Fractions with Unlike Denominators

The video tutorial addresses the problem of subtracting fractions with different denominators. It explains the process of finding the lowest common denominator, which is 63 in this case, and demonstrates how to convert the fractions to have this common denominator. The tutorial then shows how to subtract the fractions once they share the same denominator, resulting in the final answer of 11/63.

What is the problem the teacher is trying to solve?

What is the lowest common denominator mentioned in the text?

How does the teacher convert 2/7 to a fraction with a denominator of 63?

What is the result of subtracting 7/63 from 18/63?

What final answer does the teacher arrive at after the subtraction?