2 24 Adding & Subtracting Fractions With Unlike Denominators
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This document provides examples for adding and subtracting fractions with unlike denominators. It explains that to add fractions with different denominators, you must first find the least common denominator and convert the fractions so they have the same denominator. Then you can simply add the numerators and keep the common denominator. Subtraction follows the same process. Several word problems are worked through step-by-step as examples.
2 24 Adding & Subtracting Fractions With Unlike Denominators
- 1. Adding & Subtracting Fractions with unlike denominators12/8/09EQ: How do I add & subtract fractions when the denominator is different? 12/8/20091Bitsy Griffin Lessons 2-24 & 25
- 2. Review:How do you add fractions with the same denominator?12/8/20092Bitsy Griffin Lessons 2-24 & 25
- 3. Problem 1:Eleni ate ¼ box of cereal.Freddie ate 3/8 box of the same box of cereal.12/8/20093Bitsy Griffin Lessons 2-24 & 25
- 4. Problem 1:What portion of the box did they eat in all?12/8/20094Bitsy Griffin Lessons 2-24 & 25
- 5. Problem 1:What needs to happen to add these 2 fractions?Need same denominator.12/8/20095Bitsy Griffin Lessons 2-24 & 25
- 6. Problem 1:Need same denominator.Least Common DenominatorLCD12/8/20096Bitsy Griffin Lessons 2-24 & 25
- 7. Problem 1:How can we get the same denominator?¼ =2/812/8/20097Bitsy Griffin Lessons 2-24 & 25
- 8. Problem 1:2/8 + 3/8 = 5/8Can it be simplified?12/8/20098Bitsy Griffin Lessons 2-24 & 25
- 9. Problem 1:How much more did Freddie eat? 3/8 - 2/8 = 1/8Can it be simplified?12/8/20099Bitsy Griffin Lessons 2-24 & 25
- 10. Problem 2:How would we solve:¼ + 2/3Common denominator is?1212/8/200910Bitsy Griffin Lessons 2-24 & 25
- 11. Problem 2:¼ = ?/12 3/122/3 = ?/128/1212/8/200911Bitsy Griffin Lessons 2-24 & 25
- 12. Problem 2:3/12 + 8/12 =11/12Can it be simplified?12/8/200912Bitsy Griffin Lessons 2-24 & 25
- 13. Problem 2:3/12 + 8/12 =11/12Can it be simplified?12/8/200913Bitsy Griffin Lessons 2-24 & 25
- 14. Problem 3:Rosa bought 4/6 yd of copper pipe. She used ½ yd to repair the shower. 12/8/200914Bitsy Griffin Lessons 2-24 & 25
- 15. Problem 3:How much pipe does she have left?Set up problem.12/8/200915Bitsy Griffin Lessons 2-24 & 25
- 16. Problem 3:4/6 – ½ =What do we need to do?12/8/200916Bitsy Griffin Lessons 2-24 & 25
- 17. Problem 3:½ = ?/63/64/6 – 3/6 = 1/6Can it be simplified?12/8/200917Bitsy Griffin Lessons 2-24 & 25
- 18. Problem 3:¾ - 1/3 =What is the LCD?1212/8/200918Bitsy Griffin Lessons 2-24 & 25
- 19. Problem 3:¾ = ?/129/121/3 = ?/124/1212/8/200919Bitsy Griffin Lessons 2-24 & 25
- 20. Problem 3:9/12 - 4/12=5/12Can it be simplified?12/8/200920Bitsy Griffin Lessons 2-24 & 25
- 21. EQ:How do I add & subtract fractions when the denominator is different?12/8/200921Bitsy Griffin Lessons 2-24 & 25