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Working with unlike fractions

Working with unlike fractions. Introducing: Unlike fractions. 3 4. 1 2. Compare Fractions 1. 3 4. 5 8. The fractions and have unlike denominators and unlike numerators. Fractions that have unlike denominators are unlike fractions. Compare Fractions 2. 3 4. 5 8.

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Working with unlike fractions

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  1. Working with unlike fractions Introducing: • Unlike fractions 34 12

  2. Compare Fractions 1 34 58 The fractions and have unlike denominators and unlike numerators. Fractions that have unlike denominators are unlike fractions.

  3. Compare Fractions 2 34 58 To compare and , rename one or both fractions with like denominators making them like fractions. Then compare the numerators. In this case, is renamed as so that we can compare the numerator of and . 34 6 8 68 58

  4. 12 78 If Anna is of a mile away from the shore and Alo is of a mile away from the shore, how much more does Anna need to reach Alo? 12 78

  5. 12 44 48 = X Anna is of a mile away from the shore. *So Anna needs to row of a mile to reach Alo. 48 78 48 38 = - 38

  6. Compare Fractions 3 35 1220 34 1520 35 < 34 35 34 The numerators are the same in and . The smaller denominator will give a larger fraction.

  7. I’m going to say this again because it’s really important When the numerators are the same, the fraction with the smaller denominator is a larger number

  8. Would you rather have ½ or ¼ ? When the numerators are the same, the fraction with the smaller denominator is a larger number

  9. Compare Fractions 4 25 23 The fractions and have the same numerator. The denominator 5 in the fraction means that the unit has more parts, making the parts smaller. Therefore, is smaller than . 25 25 23

  10. Compare Fractions 5 The larger the denominator the smaller the fraction.

  11. 22 25 410 = X 110 Saki and Hachi packed buffalo hides in a cart. Saki filled of the cart while Hachi filled of the cart. How much of the cart is filled? 25 510 110 410 + =

  12. 510 12 Hachi and Saki filled up of the cart with hides, which can be simplified to . 12

  13. Compare Fractions 6 Another method for comparing is to think of the fractions. In this example it is obvious that is smaller than . For one thing, is smaller than and is larger than . 13 78 12 13 12 78

  14. Compare Fractions 7 Being able to compare fractions by picturing them in your mind will help you arrive at an answer more quickly than with calculation. As mentioned before, as the numerator increases it means that you have selected more parts. As the denominator increases it means that the parts are smaller. Which is larger, or ? 58 716

  15. Compare Fractions 8 58 is larger. It takes practice, but being able to estimate by visualizing the fraction (number sense) will help you to understand fractions better.

  16. 14 22 28 x = 14 Tasina and Hoksinato went on a hunt for buffalo but they were surrounded by a group of snakes. To protect themselves, Tasina shot of the snakes while Hoksinatoshot of the snakes. How many snakes did Tasina and Hoksinato kill? 38 28 58 38 + =

  17. Tasina and Hoksinato shot of the snakes. 58

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