Addition & Subtraction of Fractions

Objectives:

·        To develop an understanding of addition of fractions

·        To develop an understanding of subtraction of fractions

·        To practice fraction addition problems

·        To practice fraction subtraction problems

·        To become skillful in doing addition and subtraction fraction problems as needed for the GED or other educational goals

Outcomes:

·        To correctly complete a fraction addition worksheet

·        To correctly complete a fraction subtraction worksheet

Warm-Up:

1.  To create a worksheet on addition and subtraction of fraction problems, click here  http://www.mathbuilder.com/cgi-bin/m.cgi?FT=401&F=FIVE68. 

 

2.  If you complete less than 20 correctly on the worksheet, go to the New Instruction section of this page.

New Instruction:

1.  To develop an understanding of addition and subtraction of fractions, click here http://www.math.com/school/subject1/lessons/S1U4L3GL.html.  Do Step 1 through Step 4.  

 

2.  To continue developing your understanding of addition and subtraction of fractions, click here http://www.kidsolr.com/math/fractions.html and complete Add/Subtract Fractions & Mixed Numbers.  Pay particular attention to Subtracting Mixed Numbers on pages 10 and 11 for borrowing instruction.

Feedback and Review:

1.  To practice your addition fraction problems, click here http://www.visualfractions.com/.  Scroll down to Add Fractions and complete all six sections.  Read the instructions at the bottom of the page and complete correctly 20 problems at the top of the page.

·      Add Fractions With Lines or Add Fractions With Circles will give you instruction and practice in addition of fractions. Each addend in this program has like denominators.

·      Add Unlike Fractions With Lines or Add Unlike Fractions With Circles will give instruction and practice in addition of fractions with unlike denominators. Common denominators may be required.

·      Add Fractions-Strict With Lines or Add Fractions-Strict With Circles will give instruction and practice in addition of fractions with unlike denominators. The sum must be entered as a mixed number and in lowest terms.

2.  To practice your subtraction fraction problems, click here http://www.kidsolr.com/math/fractions.html.  Scroll down to Subtract Fractions and complete all four sections.  Read the instructions at the bottom of the page and complete correctly 20 problems at the top of the page.

·        Subtract Fractions With Lines or Subtract Fractions With Circles will give instruction and practice in subtracting fractions with unlike denominators. The concept of "borrowing" is introduced.

·        Subtract Fractions-Strict With Lines or Subtract Fractions-Strict With Circles will give instruction and practice in subtracting fractions with unlike denominators. The difference must be entered as a mixed number and in lowest terms.

Transfer of Knowledge or Skills:

1.  To create a worksheet on addition and subtraction of fractions, click here  http://www.mathbuilder.com/cgi-bin/m.cgi?FT=401&F=FIVE68.   If you complete less than 20 correctly on the worksheet, go to:

·        New Instruction:

o       Activity 1 http://www.math.com/school/subject1/lessons/S1U4L3GL.html or

o       Activity 2 http://www.kidsolr.com/math/fractions.html or

·        Feedback and Review: 

o       Activity 1 http://www.visualfractions.com/ or

o       Activity 2 http://www.visualfractions.com/

 

 2.  When you have successfully completed this activity, go back to the math home page.