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Cross Reducing
 

Cross Reducing

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    Cross Reducing Cross Reducing Presentation Transcript

    • A Shortcut Using Cross-Division to put our multiplication answers into simplest form quickly.
    • Simplifying Fractions
      • Start with a multiplication statement that looks like it will need to be simplified.
    • Cross Reducing
      • Normally, you would multiply the top numbers and then the top.
      • Then check to see if your fraction is in simplest form.
    • Cross Simplifying
      • Now let’s look to see if we can cross reduce.
      • First check the upper left and lower right corner.
      • Is there any number that can divide evenly into 2 or 5?
      Nope!
    • Cross Simplifying
      • Now let’s look to see if we can cross reduce the other pair.
      • Check the upper right and lower left corners.
      • Is there any number that can divide evenly into 3 or 3?
      Yes! 3
    • Let’s divide
      • Since we can divide three into three at the top and do the same at the bottom, we do it right in the problem.
    • Cross out
      • Cross out the 3’s
      • Divide the bottom left number by 3.
      • Replace the three with a one.
      • Divide the top right number by 3.
      • Replace the three with a one.
      1 1
    • New Problem
      • Multiply the top numbers.
      • Multiply the bottom numbers.
      • It will often be in simplest form after cross reducing and multiplying.
      1 1
    • Watch one
      • Cross out the numbers divisible by 5.
      • Divide the bottom left number by 5.
      • Replace the five with a one.
      • Divide the top right number by 5.
      • Replace the ten with a two.
      1 2
    • New Problem
      • Now proceed with the newly formed problem.
      1 2
    • Try these two.
    • Try these two.
      • Divide the 10 and 15 by 5
      • Make the 6 a fraction.
      • Divide the 2 and 6 by 2.
      3 2 3 1
    • Make a mixed number. 1 -2 1
    • Work on Worksheet F4