adding and subtracting quick and dirty fractions method!
Post on 08-Feb-2016
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Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
Adding and SubtractingQuick and Dirty
Fractions Method!Adult Numeracy N2/L2.4: Use fractions to add, subtract, multiply and divide amounts or quantitiesFunctional Mathematics Level 2: Add and subtract fractions- add and subtract using halves, thirds, quarters, fifths and tenths
Kindly contributed to www.skillsworkshop.org by Keith Burnett, Sutton Coldfield College. ping.keith@googlemail.com To see more of Keith’s resources, including a traditional approach to adding and subtracting fractions visithttp://www.slideshare.net/keithpeter
Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
You can add two fractions by doing three multiplications and an addition!
Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
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Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
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Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
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Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
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Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
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Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
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3 3
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9
Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
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9 5 2
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9 10
Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
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9 10
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9 10
5 3
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9 10
15
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9 10
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1915
9 10
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1 415
Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
An example that has denominators with a common factor…
Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
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Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
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5 9
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Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
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Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
You had to cancel down at the end because of the common factor…
Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
Mixed numbers?
Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
Mixed numbers?Just convert to improper fractions and carry on…
Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
Subtraction?
Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
Subtraction?Just subtract the top totals instead of adding…
Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
Your turn…
Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
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Answer on next slide…
Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
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Keith Burnett, Sutton Coldfield College, ping.keith@googlemail.com
Make up some more questions and check them with your calculator
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