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 !