Download Equivalent Fractions Completed Objective 09/16/09: • Use fractions

Completed
Equivalent Fractions
Target Skills:
Objective 09/16/09:
• Use fractions to find the fraction length of a whole.
 Consider the size of the whole when comparing fractions
1. LAUNCH (Day 5 - 10 minutes)
A fraction is a part of a whole. The two parts of a fraction
called the numerator and the denominator play important
roles.
The denominator is the total amount. It is like the last name
of a brother and sister that have the same parents. The
mother, father and children all have the same last name.
Their last name tells you that they belong to the same family.
Their first names tell who they are in the family. The
numerator is like the first names of the members of the
family. The numerator tells you how many out of the total are
represented.
4/5 shapes are squares
In this fraction there are a total of five shapes and four out of
the five are squares.
Because fractions belong to families you can find who is
related by finding the lowest common factor between
fractions.
A factor is a whole number that divides into another number
without leaving a remainder.
Simplify the fraction by find the lowest common factor:
1/3 and 2/6
Look at the denominators. What factors do both numbers
share? What numbers can be divided into both?
1. Divide the common factor into the larger denominator
2. Use the quotient to divide the numerator and
denominator of the larger fraction.
These families are called equivalent fractions. The word
Targets
Do Now (3 minutes):
What is 425 x 15?
equivalent means equal in value. Equivalent fractions
describe the same amount.
To create an equivalent fraction multiply the fraction by a
fraction form of 1.
The number 1 can be written as a fraction by writing the
same number over itself. 5/5 or 4/4
2. EXPLORE (20 minutes)
Targeted Resources
Fraction Strips
Take your fraction strips and try to find as many fraction families as you can. When you find a family
member write a string of fractions to show their equal value.
1/3 = 3/6
3. SUMMARIZE (5 minutes)
Targeted Resources
Is 2/12 the same as 4/24? How can you be sure?
4. HOMEWORK (10 minutes)
Math Handbook
Page 105: 10-16
Targeted Resources