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Adding & Subtraction Fractions with unlike denom
- 3. + We need a common denominator to add these fractions.
- 4. 7, 14, 21, 28, 35… 2, 4, 6, 8, 10, 12, 14, 16, 18, 20 Count by 2's Count by 7's + We need a common denominator to add these fractions.
- 5. 7, 14, 21, 28, 35… 2, 4, 6, 8, 10, 12, 14, 16, 18, 20 Count by 2's Count by 7's The first number IN COMMON that appears on both lists becomes the common denominator
- 6. + = x 2 x 2 = X 7 x 7 7 6 7 + 6 = 13 Add the numerators 13 Make equivalent fractions.
- 7. 5, 10, 15, 20, 25, 30, 35, 40, 45 7, 14, 21, 28, 35, 42, 49, 56, 63 Count by 7's Count by 5's + We need a common denominator to add these fractions.
- 8. = x 7 x 7 = X 5 x 5 15 7 + 15 + 7 = 22 Add the numerators 22 Make equivalent fractions.
- 9. 7, 14, 21, 28, 35, 42, 49, 56, 63 8, 16, 24, 32, 40, 48, 56, 64, 72 Count by 7's Count by 8's We need a common denominator to add these fractions. +
- 10. = x 7 x 7 = x 8 x 8 32 21 + 32 + 21 = 53 Add the numerators 53 Make equivalent fractions.
- 11. 3, 6, 9, 12, 15, 18, 21, 24, 27 5, 10, 15, 20, 25, 30, 35, 40, 45 Count by 3's Count by 5's + We need a common denominator to add these fractions.
- 12. X 3 = x 5 x 5 = x 3 9 10 + 9 + 10 = 19 Add the numerators 19
- 13. 3, 6, 9, 12, 15, 18, 21, 24, 27, 30, 33 11, 22, 33, 44, 55, 66, 77… Count by 3's Count by 11's + We need a common denominator to add these fractions.
- 14. = x 11 x 11 = X 3 x 3 15 22 + 15 + 22 = 37 Add the numerators 37 Make equivalent fractions.
- 15. 3, 6, 9, 12, 15, 18, 21, 24, 27 Count by 3's Count by 6's 6, 12, 18, 24,… + We need a common denominator to add these fractions.
- 16. = x 1 x 1 = X 2 x 2 4 1 + 4 + 1 = 5 Add the numerators 5 Make equivalent fractions.
- 17. 11, 22, 33, 44, 55, 66, 77… Count by 11's 6, 12, 18, 24, 30, 36, 42, 48, 54, 60, 66, 72 + We need a common denominator to add these fractions.
- 18. = x 11 x 11 = X 6 x 6 18 11 + 29 18 + 11 = 29 Add the numerators. Make equivalent fractions.
- 19. + We need a common denominator to add these fractions.
- 20. 9, 18, 27, 36, 45, 54, 63, 72, 81 5, 10, 15, 20, 25, 30, 35, 40, 45 Count by 5's Count by 9's + We need a common denominator to add these fractions.
- 21. 9, 18, 27, 36, 45, 54, 63, 72, 81 5, 10, 15, 20, 25, 30, 35, 40, 45 Count by 5's Count by 9's The first number IN COMMON that appears on both lists becomes the common denominator
- 22. + = x 5 x 5 = x9 x 9 36 35 36 + 35 = 71 Add the numerators. 71 Make equivalent fractions. 36 + 35 = 71 Add the numerators. Make equivalent fractions.
- 23. 12, 24, 36, 48, 60, 72, 84, 96 8, 16, 24, 32, 40, 48, 56, 64, 72, 79, 80, 88, 96 Count by 12's Count by 8's + We need a common denominator to add these fractions.
- 24. + = x 3 x 3 = x 2 x 2 19 10 + 9 = 19 Add the numerators. Make equivalent fractions. 9 10
- 25. 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55 11, 22, 33, 44, 55, 66, 77… Count by 11's Count by 5's - We need a common denominator to subtract a fraction from another.
- 26. = x 5 x 5 = x 11 x 11 4 15 - 11 = 4 Subtract. Make equivalent fractions. - 15 11
- 27. 2, 4, 6, 8, 10, 12, 14, 16, 18, 20 … 10, 20, 30… Count by 2's Count by 10's - We need a common denominator to subtract one fraction from another.
- 28. = x 1 x 1 = x 5 x 5 2 5 – 3 = 2 Subtract. Make equivalent fractions. - 5 3
- 29. Try These A F E B C D
- 31. Try These A F E B C D 17 27 19 20 10 9 41 28 26 21 13 12