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Adding and Subtracting Fractions

Adding and Subtracting Fractions

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Adding and Subtracting Fractions

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  1. Adding and Subtracting Fractions

  2. DON’T COPY 3 Apples + 5 Apples = 7 Oranges + 4 Oranges = 5 Apples – 2 Apples = 2 Quarters + 5 Quarters = 4 Fifths + 3 Fifths = 7 Halves + 2 Halves = 4 Apples + 6 Oranges = 4 Halves + 6 Fifths = You cannot add things that are not the same type.

  3. When adding and subtracting fractions you can only add them if they have the same denominator (bottom number). and can be added. and cant be added unless we can change the fractions to have the same denominator. 4 3 2 3 1 5 7 8

  4. 1. 5 3 4 4 2. 2 3 7 7 3. 1 14 6 6 4. 3 5 9 9 5. 3 9 12 12

  5. 1. 5 1 7 7 2. 5 3 8 8 3. 4 3 3 3 4. 13 5 8 8 5. 3 9 10 10

  6. If the fractions do not have the same denominator you can change them into equivalent fractions. 1 2 4 3 3 8 11 12 1212

  7. The easiest way is to multiply both denominators together to get the answer denominator. Here 4 x 5 = 20. Here 3 x 4 = 12. 5 3 ? 4 5 20 2 3 ? 3 4 12

  8. What denominators would the answer have? 1. 5 1 ? 7 4 2. 5 3 ? 3 11 3. 4 3 ? 9 5 4. 13 5 ? 2 5 5. 3 9 ? 23 10

  9. The numerators are multiplied by the other denominators. 5 3 4 7 28 28 5x7 3x4 47 35 12 28 2828

  10. 3 2 4 3 3x3 2x4 12 12 17 9 8 12 1212 1 8 7 5 1x5 8x7 35 35 61 5 56 35 3535

  11. 5 2 4 5 5x5 2x4 20 20 17 25 8 20 2020 5 3 2 4 5x4 2x3 8 8 14 20 6 8 88 7 4

  12. 5 3 6 2 5x2 3x6 12 12 28 10 18 12 1212 7 3 1 7 2 5 1x5 7x2 10 10 -9 5 14 10 1010