Basic FractionsClass - 3 : Basic FractionsClass - 3 By:
Monali Thakur
monali_253@yahoo.co.in
What is a Fraction? : What is a Fraction? A fraction is a ratio of two whole numbers.
E.g. 4/5
4 is the numerator
5 is the denominator
If the denominator is greater than numerator , then it is called an improper fraction.
Equivalent fractions : Equivalent fractions 3/4 , 6/8 , 9/12 , 12/16 , 15/20
The process of dividing the numerator and the denominator by the same whole number is called simplifying
When a fraction has been simplified and can be simplified no more , the fraction is said to be in its lowest possible terms.
Mixed fraction : Mixed fraction A mixed fraction is a mix of a whole number and a fraction
E.g. 1 ½
To convert a mixed fraction into an improper fraction
1 ½ = (1*2+1)/2
To convert an improper fraction to a mixed fraction
7/2 = 3 ½
It is written in the form of Q R/D
Write 5 equivalent fractions for 3/4 : Write 5 equivalent fractions for 3/4
Write 8/20 in its lowest form : Write 8/20 in its lowest form
Write 30/4 as a mixed fraction : Write 30/4 as a mixed fraction
Write 6 2/3 as an improper fraction : Write 6 2/3 as an improper fraction
Slide 9 : There were 8 frogs on a log. 3 hopped away. How do you write
a fraction of the frogs that hopped away?
Slide 10 : There are 7 boys in a group.5 of the boys scored full marks in maths. How do you write a fraction of the boys who scored full marks?
Slide 11 : Which fraction is equivalent to 8/12?
2/3
7/10
5/7
9/12
Slide 12 : Reduce 15/40 to its lowest form Reduce 36/60 to its lowest form.
Slide 13 : What number is 3/5 of 10? What number is 2/3 of 36?
Slide 14 : Two – thirds of the 6 plates in the cupboard are blue. How many blue plates are in the cupboard? The school choir has 9 members. Two-thirds of the members are girls. How many girls are in the choir?
Slide 15 : Addition and Subtraction of fractions
Slide 16 : Add 2/3 and 5/3: Add 6/9 and 2/3:
Slide 17 : Subtract:
Slide 18 : At my birthday party , the girls ate 3 ½ pizzas and the boys ate 7 ½ pizzas . How many pizzas were eaten at my party?
Slide 19 : I bought 2 ½ gallons of paint but I only used 2/4 gallons of the paint. How much paint do I have left?
Slide 20 : My dog is 5 ½ years old. My cat is 3 ½ years younger than my dog. How old is my cat?
Slide 21 : Multiplication of fractions
Slide 22 :
Slide 23 :
Slide 24 : Division of fractions
Slide 25 :
Slide 26 : Any doubts???
Slide 27 : Thank you!!