1MPES2Reduce Fractions
Multiply and Divide on
Ecole Supérieure de Commerce de Neuchâtel
Pierre Marchal17.09.2015
http://creativecommons.org/licences/by/3.0/Attribute to: Pierre Marchal (Lycée Jean-Piaget)
Objectives of the course
By the end of the course, you should be able to:– Factorize the numerator and the denominator– Identify the common factors– Reduce the common factors– Multiply and divide fractions
Reduce Fractions
• To reduce fractions we
common
divide out
factors
EXAMPLES OF APPLICATION
3 83 5
=
Remember :First factorize Identify the common factorReduce the common factor
85
6 86 3
=
Remember :First factorize Identify the common factorReduce common factor
83
Not allowed!
PRACTICE EXERCISES
Reduce the following fractions
Multiply / Divide Fractions
• First common
Then multiply
• Division is the same, with one extra step at the start: by the
divide out
across
multiply
reciprocal
factors
EXAMPLES OF APPLICATION
=9
25
Remember:Factorize first Before reducingThen multiply across
=1
4
Warning: when everything divides out the result is 1, not 0
Exercises
By the end of this course
• You are able to :– Factorize the numerator and the denominator– Identify the common factors– Reduce the common factors– Multiply and divide fractions
Any question ?
THANKS FOR YOUR ATTENTIONSee you on Monday and please learn your lesson !