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Tuesday, July 9, 2013

Fraction Level 3

I am learning to solve the problems by using  Reversibility at level 3

This task is about finding fractions of a given number

A farmer is selling some of his animals.

1.  The farmer sells ¼ of his 72 cows.  Show how to work out how many cows he sells.


4x__=72


4x10=40

4x8=32
40+32=72

Answer is 72


2. He sells ⅓ of his 45 pigs.  Show how to work out how many pigs he sells.

‘3x__=45

3x10=30
3x5=15
30+15=45

Answer is 15


3.   He sells ⅙ of his 84 sheep.  Show how to work out how many sheep he sells.

6x__=84

6x10=60
6x4=24
60+24=84      

Answer 14



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