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ractions

&. dding. ubtracting. ractions. Vocabulary. Numerator- the number on top in a fraction. Denominator- the number on bottom in a fraction. Least Common Multiple- the smallest number that is in common with two or more numbers.

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ractions

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  1. & dding ubtracting ractions

  2. Vocabulary • Numerator- the number on top in a fraction. • Denominator- the number on bottom in a fraction. • Least Common Multiple- the smallest number that is in common with two or more numbers. • Least Common Denominator- the smallest number that is a multiple of both denominators in a pair of fractions.

  3. Vocabulary • Numerator- the number on top in a fraction. • Denominator- the number on bottom in a fraction. • Least Common Multiple- the smallest number that is in common with two or more numbers. • Least Common Denominator- the smallest number that is a multiple of both denominators in a pair of fractions.

  4. We need a common denominator to add these fractions. +

  5. We need a common denominator to add these fractions. + Count by 2's 2, 4, 6, 8, 10, 12, 14, 16, 18, 20 Count by 7's 7, 14, 21, 28, 35…

  6. Count by 2's 2, 4, 6, 8, 10, 12, 14, 16, 18, 20 Count by 7's 7, 14, 21, 28, 35… The first number IN COMMON that appears on both lists becomes the common denominator

  7. x 7 7 Make equivalent fractions. = X 7 x 2 6 Add the numerators = + 7 + 6 = 13 x 2 13

  8. We need a common denominator to add these fractions. + Count by 7's 7, 14, 21, 28, 35, 42, 49, 56, 63 Count by 8's 8, 16, 24, 32, 40, 48, 56, 64, 72

  9. 32 x 8 Make equivalent fractions. = x 8 21 Add the numerators x 7 + 32 + 21 = 53 = x 7 53

  10. We need a common denominator to add these fractions. + Count by 3's 3, 6, 9, 12, 15, 18, 21, 24, 27 Count by 6's 6, 12, 18, 24,…

  11. 4 x 2 = X 2 Make equivalent fractions. 1 x 1 + Add the numerators = x 1 4 + 1 = 5 5

  12. We need a common denominator to add these fractions. + Count by 11's 11, 22, 33, 44, 55, 66, 77… 6, 12, 18, 24, 30, 36, 42, 48, 54, 60, 66, 72

  13. Subtracting Fractions

  14. We need a common denominator to subtract a fraction from another. - Count by 5's 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55 Count by 11's 11, 22, 33, 44, 55, 66, 77…

  15. 15 x 5 Make equivalent fractions. = x 5 11 x 11 Subtract. = 15 - 11 = 4 - x 11 4

  16. We need a common denominator to subtract one fraction from another. - Count by 2's 2, 4, 6, 8, 10, 12, 14, 16, 18, 20 … Count by 10's 10, 20, 30…

  17. 5 x 5 Make equivalent fractions. = x 5 3 x 1 Subtract. - = 5 – 3 = 2 x 1 2

  18. Try These A D E B F C

  19. Answers On Next Slide • Each click on the next slide reveals an answer. • Check your papers. • If you discover an incorrect answer, be able to explain your mistake.

  20. 17 27 19 20 10 9 41 28 26 21 13 12 Try These A D B E C F

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