Subtracting Fractions with Unlike Denominators
Subtracting Fractions with Unlike Denominators is a Grade 5 math skill in Eureka Math, Chapter 17: Making Like Units Numerically, where students find a common denominator, convert both fractions, and subtract numerators. This completes the foundation for all four fraction operations.
Key Concepts
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. $$\frac{a}{b} \frac{c}{d} = \frac{ad}{bd} \frac{cb}{bd} = \frac{ad cb}{bd}$$.
Common Questions
How do you subtract fractions with unlike denominators?
Find a common denominator, convert both fractions to equivalent fractions with that denominator, subtract the numerators, and simplify the result.
What is the first step when subtracting fractions with different denominators?
Find the least common multiple of the two denominators so both fractions represent the same-size units.
What is Eureka Math Grade 5 Chapter 17 about?
Chapter 17, Making Like Units Numerically, covers adding and subtracting fractions with unlike denominators using a common denominator and equivalent fractions.