1MPES2 Reduce Fractions Multiply and Divide on Ecole Supérieure de Commerce de Neuchâtel Pierre Marchal 17.09.2015

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 !