FUN WITH FRACTIONS!

Objectives The students will add and subtract

fractions with like denominators. The students will simplify fractions. The students will find least common

denominators. The students will find a common

denominator to add and subtract fractions with unlike denominators.

Standards2.1 Numbers, Number Systems and Number

Relationships 2.1.5.D Use models to represent fractions.

2.1.5.G Develop and apply number theory concepts to represent numbers in various ways.

2.2 Computation and Estimation 2.2.5.C Develop and apply algorithms to solve

word problems that involve addition and/or subtraction with factions that include like and unlike denominators

Adding and Subtracting Fractions

with Like Denominators

Copy the Denominator

Add the top

Are you ready to add and subtract

fractions with common

denominators?

Test of Simplifying Fractions

If you can count by a number other than 1 to reach both parts of

the fraction!

Time to Practice!!!!

Finding Least Common

Denominators Make a list of multiples for each

denominator.

Circle the common multiples.

What is the least common denominator???

Let’s practice finding the

least common denominators!

Steps to Adding and Subtracting Fractions

Set-up the Problem Finding the

Adding and Subtracting Fractions with Unlike

Denominators Find the common denominator

Make equivalent fractions

Copy the denominator

Add the top

Are you up to the challenge??

?

References

Slide 1 and 9 Math Mastery: Fractions. Math Mastery(2001). Retrieved November 4, 2008, fromDiscovery Education: http://streaming.discoveryeducation.com/

Slide 6Example 1: Adding Fractions with a Common Denominator--Baking Cake. Discovery Channel School(2005). Retrieved November 4, 2008, fromDiscovery Education: http://streaming.discoveryeducation.com/

Slide 15Example 3: Adding Fractions with Different Denominators--Serving Salsa. Discovery Channel School(2005). Retrieved November 4, 2008, fromDiscovery Education: http://streaming.discoveryeducation.com/