Adding and Subtracting Fractions Presentation.pptx

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1. Adding and Subtracting Fractions 1 4 2 3 10 7 9 1 3 Master adding & subtracting unlike fractions

2. Lesson Outcomes Add fractions with unlike denominators Subtract fractions with unlike denominators Solve word problems

3. Unlike Fractions _ 1 4 1 5 _ and different denominators fractions that have different denominators whole number proper fraction Mixed Number _ 1 3 2 a combination of a whole number and a proper fraction Let's Recall

4. Danni ate 1/2 of a slice of watermelon. Kai ate 1/6 of a slice of watermelon. How much watermelon did Danni and Kai eat altogether? Let's go on a picnic!

5. 1 2 1 2 _ 3 6 _ ×3 ×3 _ + 1 6 _ 3 6 _ Equivalent Fractions Danni ate 1/2 of her watermelon, and Kai ate 1/6. How much did they eat in total? Step 1: Find a common factor. Adding Unlike Fractions

6. Add the numerators and keep the denominators the same. + + 1 6 _ 1 2 _ 3 6 _ 1 6 _ = 4 6 _ Danni ate 1/2 of her watermelon, and Kai ate 1/6. How much did they eat in total? Step 2: Add the fractions. Adding Unlike Fractions

7. 3 4 9 12 ×3 ×3 Equivalent Fractions 2 3 8 12 ×4 ×4 Equivalent Fractions 3 4 - - 2 3 9 12 8 12 _ _ _ _ Ellis took 3/4 kg of lemons to make lemonade. She only used 2/3 of the lemons. How much did she have left? Step 1: Find a common multiple. Subtracting Unlike Fractions

8. 3 4 - - 2 3 9 12 8 12 = 1 12 _ Ellis took 3/4 kg of lemons to make lemonade. She only used 2/3 of the lemons. How much did she have left? Step 2: Subtract the fractions. Subtracting Unlike Fractions Subtract the numerators and keep the denominators the same.

9. 3 4 - - 2 3 9 12 8 12 = 1 12 _ 1 2 Let's have a recap! Before adding or subtracting fractions, they must have the same denominator. So, we must find a common multiple. Add or subtract the numerators and keep the denominators the same.

10. Let's try these! 8 _ 5 4 _ 1 Sam lives km away from school, while Zac lives km away from school. How much farther is Sam's house than Zac's house from the school? 7 _ 3 Farmer Ren has kg of papaya, while farmer Neil has kg of papaya. How many kilograms of papaya do they have altogether? 2 _ 1 1. 2.

11. Let's try these! _ _ _ - = - 5 8 _ 5 8 2 8 _ 1 4 = 3 8 Sam's house is 3/8 km farther than Zac's house. + = + 6 14 3 7 _ _ 7 14 1 2 _ _ = 13 14 _ Farmer Ren and Farmer Neil have a total of 13/14 kg of papaya. Answer Key Answer Key 1 2