Common Denominator:The common denominator is the least common multiple of the denominators of the fractions being subtracted, which allows the fractions to be expressed with the same denominator for subtraction.
Least Common Multiple (LCM): The least common multiple is the smallest positive integer that is divisible by all the denominators of the fractions being subtracted, which is used to find the common denominator.
Equivalent Fractions:Equivalent fractions are fractions that represent the same value, but have different numerators and denominators, which is necessary for aligning fractions with a common denominator during subtraction.