Mathsfraction

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Mathsfraction

  1. 1. MATHEMATICS YEAR 4 FRACTIONS NOTES (ADDING & SUBSTRACTING)
  2. 2. FRACTION: HOW TO ADD?? When the denominators are the same… We have a rectangle that is cut into 4 pieces... Each piece is and 2 pieces are If we add , that would be… 4 4 + = 1 4 2 4 1 2 + = 3 4
  3. 3. When the denominators are different… We need to find least common denominator (LCD) For example, The LCD for 2 and 3 is 6… Change : Change :
  4. 4. When the denominators are the same… We have a rectangle that is cut into 6 pieces... Each piece is . So, HOW TO SUBTRACT?? (5 pieces) Take away 2 pieces, So, (3 pieces are left) 1 6 5 6 - 2 6 5 6 = 5 6 - 2 6 = 3 6
  5. 5. When the denominators are different… When the denominators are different…
  6. 6. FRACTIONS TASK : PROBLEM SOLVING (ADDING & SUBSTRACTING)
  7. 7. <ul><li>Sally ate ⅛ of cake and her sister ate ⅜ of it. What fraction did they eat altogether? </li></ul><ul><li>Arif mowed 3/10 of the lawn and Tina mowed 5/10 of the lawn. How much of the lawn has been mowed? </li></ul>
  8. 8. <ul><li>3. May planted 1/3 of her vegetable garden in the morning and another 1/3 of it in the afternoon. What fraction of her garden was planted in one day? </li></ul><ul><li>Jill studied math for 2 3/4 hours and Spanish for 1 2/3 hours. What was her total study time? </li></ul>
  9. 9. <ul><li>Ashley made a muffin. She used 1 2/3 cups of white flour and 3 cups of whole-wheat flour. How much flour did she use in all? </li></ul><ul><li>Sidhu had 8 dollars. He spent ⅝ of his money on candy and another ¼ of his money on soda. What fraction of his money did he spend altogether? </li></ul>
  10. 10. <ul><li>Maria collects 1 ¼ boxes of litter from the roadside. Amy collects 2 ¾ boxes. How many boxes of litter did they collect in all? </li></ul><ul><li>There are seven pieces of pizza. Roy ate 3/8 of the pizza for dinner. He ate 3/8 of the pizza for a bedtime snack. How much of the pizza is left? </li></ul>
  11. 11. <ul><li>Miss Lee brought 4 4/5 pounds of candy to school. The students in third grade ate 2 ½ pounds of the candy. How much did Miss Lee have left? </li></ul><ul><li>A plumber needs 8 ¾ metres of pipe to repair a water line. He has only 4 ½ metres of pipe. How many more metres of pipe does he need? </li></ul>
  12. 12. <ul><li>Adam bought 2 1/5 pounds ground beef. His mother used 1 3/5 pounds to make hamburgers. How much of the ground beef was left? </li></ul><ul><li>All of William's school books weigh a total of 5 1/2 kilograms. If he take away his math book, the total weight drops to 2 1/2 kilograms. How much does William's math book weigh? </li></ul>

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