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Add subt fractions

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1. Adding & Subtracting Fractions Teacher Notes: Use this presentation to teach the stepsfor adding and subtracting fractions withunlike denominators. It is assumed that students have athorough understanding of the process formaking equivalent fractions. CLICK HERE to view a demonstration withopportunities for students to practicemaking equivalent fractions. 2. We need a commondenominator to addthese fractions. 3. We need a commondenominator to addthese fractions.2, 4, 6, 8, 10, 12, 14, 16, 18, 207, 14, 21, 28, 35 4. 2, 4, 6, 8, 10, 12, 14, 16, 18, 207, 14, 21, 28, 35The first number IN COMMONthat appears on both listsbecomes the common denominator 5. x7 7X7x2 6x27 + 6 = 13 13 6. We need a common denominator to add these fractions.7, 14, 21, 28, 35, 42, 49, 56, 635, 10, 15, 20, 25, 30, 35, 40, 45 7. x5 15X5x77x715 + 7 = 22 22 8. We need a commondenominator to addthese fractions.7, 14, 21, 28, 35, 42, 49, 56, 638, 16, 24, 32, 40, 48, 56, 64, 72 9. x8 32x8x7 2132 + 21 = 53x7 53 10. We need a commondenominator to addthese fractions.3, 6, 9, 12, 15, 18, 21, 24, 275, 10, 15, 20, 25, 30, 35, 40, 45 11. x3 9X39 + 10 = 19x5 10x5 19 12. We need a commondenominator to addthese fractions.3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 3311, 22, 33, 44, 55, 66, 77 13. x3 15X3x 11 2215 + 22 = 37x 11 37 14. We need a commondenominator to addthese fractions.3, 6, 9, 12, 15, 18, 21, 24, 276, 12, 18, 24, 15. x2 4X2x1 1x1 4+1=5 5 16. We need a commondenominator to addthese fractions. 11, 22, 33, 44, 55, 66, 776, 12, 18, 24, 30, 36, 42, 48, 54, 60, 66, 72 17. x6 18X6x 11 11x 1118 + 11 = 29 29 18. We need a commondenominator to addthese fractions. 19. We need a commondenominator to addthese fractions.5, 10, 15, 20, 25, 30, 35, 40, 459, 18, 27, 36, 45, 54, 63, 72, 81 20. 5, 10, 15, 20, 25, 30, 35, 40, 45 9, 18, 27, 36, 45, 54, 63, 72, 81The first number IN COMMONthat appears on both listsbecomes the common denominator 21. x9 36x9x5 3536 + 35 = 71x5 71 22. We need a commondenominator to addthese fractions. 12, 24, 36, 48, 60, 72, 84, 968, 16, 24, 32, 40, 48, 56, 64, 72, 79, 80, 88, 96 23. x2 10x2x3 910 + 9 = 19x3 19 24. We need a commondenominator to subtract a fraction from another.5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 5511, 22, 33, 44, 55, 66, 77 25. x5 15x5x 11 11x 1115 - 11 = 4 4 26. We need a common denominator to subtract one fractionfrom another.2, 4, 6, 8, 10, 12, 14, 16, 18, 20 10, 20, 30 27. x5 5x5x1 3 53= 2x1 2 28. Try TheseADBECF 29. Answers On Next Slide Each click on the next slidereveals an answer. Check your papers. If you discover an incorrectanswer, be able to explainyour mistake. 30. Try These17 10A 27D9B 13E4112 28C 19F2620 21

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