In this Grade 5 Pengi Math lesson, students learn how to add and subtract fractions with unlike denominators by rewriting them with a common denominator before solving. The lesson also covers simplifying results and converting improper fractions when necessary. Students practice identifying and correcting common errors in fraction addition as part of Chapter 5 on adding and subtracting fractions and mixed numbers.
Section 1
Adding Fractions with Unlike Denominators
To add fractions with unlike denominators, convert them to equivalent fractions with a common denominator, then add the numerators. A common denominator can be found by multiplying the two denominators.
Section 2
Subtracting Fractions with Unlike Denominators
To subtract fractions with unlike denominators, find a common denominator and convert each fraction to an equivalent fraction with that denominator.
Then, subtract the numerators.
Expand to review the lesson summary and core properties.
Section 1
Adding Fractions with Unlike Denominators
To add fractions with unlike denominators, convert them to equivalent fractions with a common denominator, then add the numerators. A common denominator can be found by multiplying the two denominators.
Section 2
Subtracting Fractions with Unlike Denominators
To subtract fractions with unlike denominators, find a common denominator and convert each fraction to an equivalent fraction with that denominator.
Then, subtract the numerators.