Multiplying fractions decimals absent copy 1 3 4
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Multiplying Fractions/Decimals Absent Copy 1/3,4. Example 1. Multiply: write answer in simplest form. 3 • 7 4 9 3 • 7 = 21 4 • 9 36 Num. Denom. 21 36 7 • 3 2 • 2 • 3 • 3

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Multiplying Fractions/Decimals Absent Copy 1/3,4

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Multiplying fractions decimals absent copy 1 3 4

Multiplying Fractions/DecimalsAbsent Copy1/3,4


Example 1

Example 1

  • Multiply: write answer in simplest form.

    3 • 7

    4 9

    3 • 7 = 21

    4 • 9 36

    Num. Denom.

    21 36

    7 • 3 2 • 2 • 3 • 3

    7 • 3

    2 • 2 •3 • 3

    Solution

  • Do we need to get a common denom. when we multiply?

    • YES or NO

  • There are 2 ways to multiply.

    • 1. You can multiply straight across.

    • 2. You can cross reduce(only if you can) and then multiply across.

  • Can we reduce are answer?

    • YES or NO

  • What do we make before reducing the answer?

    • A T-chart

  • 7

    12


    Example 2

    Example 2

    • Multiply: write answer in simplest form.

      -2 ¾(½)

      -2 ¾ = -11

      4

      -11 • 1 = -11

      4 2 8

      -1 3/8

      Solution

    • What do we do first before multiplying?

      We need to change the mixed fraction into an improper fraction.

    • There are 2 ways to multiply.

      • 1.You can multiply straight across.

      • 2.You can cross reduce (only if you can) and then multiply across.

    • Can we reduce are answer?

      • YES or NO

  • What question do we ask are selves. Hint: think about the 8.

  • How many times does 8 go into 11 and how many are left over.

  • What is the integer rule we use?

  • A neg. # multiplied by a pos. # the answer is always Neg.

  • -1 3/8


    Example 3

    Example 3

    • Multiply:

      -0.06(9.3)

      -0.06

      x9.3

      018

      + 0540

      0558

      0.558

      Solution

    • How can we re-write this problem before multiplying?

    • Stack the numbers on top of each other before you multiply.

    • Do we need to line up the decimals when we multiply?

      YES or NO

    • After we multiply how many decimals places do we have to move in the answer?

    • We have to move the decimal 3 places.

    • Do we move the decimal left or right when making the final answer?

    • We move the decimal to the left from the back of the answer.

    • What is the integer rule we use?

    • Neg. # multiplied by a pos. # is always a neg. answer.

    -0.558


    Example 4

    Example 4

    • Multiply:

      -6.7

      x -0.8

      536

      +000

      536

      5.36

      Solution

      Solution

    • After we multiply how many decimals places do we have to move in the answer?

    • We have to move the decimal 2 places.

    • Do we move the decimal left or right when making the final answer?

    • We move the decimal to the left from the back of the answer.

    • What is the integer rule we use?

    • When multiplying a neg. # by a Neg. # the answer is always positive.

    5.36


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