Problem Solving: Adding and Subtracting with Fractions and

Decimals

Janie Baszile

Cobb 6th Grade Campus

GPISD

TEKS Objective

• use addition and subtraction to solve problems involving fractions and decimals

Purpose

• The purpose is to improve problem-solving skills using addition and subtraction in fractions and decimals.

• Students will be able to use key concepts to add and subtract fractions.

Review

• Let’s review some common fractions by playing a game of concentration.

• Click on the sit below. Make sure you choose fractions when you get to the site.

• http://illuminations.nctm.org/tools/tool_detail.aspx?id=73

1. When adding fractions, use a common denominator.

2. Add the numerators and keep the denominators the same.

Instructions

3.When subtracting fractions, use a common denominator.

4. Subtract the numerators and keep the denominators the same.

HOW TO ADD FRACTIONS

Introducing:

first addend second addend

sum

o

How to Add Fractions

HOW TO SUBTRACT FRACTIONS

Introducing:

minuend subtrahenddifference

How to Subtract Fractions

Guided Practice

1/4+ 1/4+ 1/4= 3/4 ; Add the top

Don’t add the bottom

9/10 – 2/10 = 7/10; Subtract the top

Don’t subtract the bottom

Independent Practice• Add .. Numerators only.• 1/5 + 1/5=___ 1/10 + 2/10=___ 1/6 + 4/6 = ___• 1/8 + 2/8=___ 5/9 +3/9 = ___

• Subtract.. Numerators only.

• 9/10 – 8/10 = ___ 4/7 – 2/7= ___• 6/9 – 3/9= ___ 4/5 – 3/5=__ 11/12 – 4/12 =

___

Summary

• This lesson will enable students to..

..gain an understanding of fractions in multiple operations.

..demonstrate the ability to add and subtracts independently with success.

Fraction Mania!

Hooray!