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## Add/Subtract Unlike Fractions

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**Add/Subtract Unlike Fractions**7th Grade Math Lesson Objective: Students will add and subtract fractions with unlike denominators.**Vocabulary**• Unlike Fractions • Fractions with different denominators**Steps**• Rename the fractions using the least common denominator (LCD) • Add or subtract as with like fractions • If necessary, simplify the sum or difference**Add Unlike Fractions 1**• Find ½ + ¼**Add Unlike Fractions 2**• Find 9/10 + (-1/2)**Add Unlike Fractions - Practice**• Add. Write in simplest form.**Subtract Unlike Fractions 1**• Find 2/3 – 1/2.**Subtract Unlike Fractions 2**• Find 1/2 – (-2/5)**Subtract Unlike Fractions - Practice**• Subtract. Write in simplest form.**Real World Example**• Cassandra cuts 5/16 inch off the top of a photo and 3/8 inch off the bottom. How much shorter is the total height of the photo now?**Real World Example - Practice**• A bucket was 7/8 fill with soapy water. After washing the car, the bucket was only ¼ full. What part of the water was used?