Compare with Circle Models uses circles to demonstrate comparing fractions.

You can un put the two fractions to compare. Each fraction must be less than one. Press the <OK> button and the number lines for the fractions will appear.

Many fractions can be compared by visualizing them, or you may compare by writing each fraction over a common denominator. Fractions written with the same denominator are known as like fractions.

If fractions are unlike, or have different denominators, you may make them like by writing over a common denominator. Here, the idea of the least common denominator or LCD can be used. For the fractions 3/4 and 2/3, The LCD is the smallest number that both denominators 4 and 3 will divide into evenly.

The LCD for the fractions 3/4 and 2/3 is 12 because both denominators 4 and 3 divide evenly into 12. Writing each fraction with the common denominator 12 will give you 9/12 and 8/12. You can now compare the numerators.

Uncheck the <EXPLAIN> check box to turn off the answer and the explanation. You can ask your students to complete the number sentence.

Uncheck the <SHOW INPUT> check box to make the input dialog boxes work like a password input boxes, hiding the numbers you input. With <EXPLAIN> and <SHOW INPUT> unchecked you can ask your students to write a number sentence that explains the picture.

With <EXPLAIN> and <SHOW COLOR> unchecked you can ask your students to complete the picture by shading the circles.

Suggestions:

Keep one of the fractions the same size, but change the size of the numerator and denominator of the other fractions and compare.

Demonstrate equivalent fractions with 2/3 and 4/6 or 1/5 and 2/10.

Demonstrate lowest terms with 4/12 and 1/3. Here, the numerator of 1/3 will have four dotted lines showing the common factor 4. It also shows that you are not "reducing" the fraction, an unfortunate expression used by many textbooks - and web sites.

You may copy the screen by pressing <Print Screen> on the keyboard. This copies the screen into Windows Clipboard™. The screen can then be pasted into Windows Paint™ or your favorite imaging program. Windows Paint™ will allow you to crop, print, or save the image.

Windows 7 users can use the Snipping Tool™ to capture any part of the screen you wish. These images can be edited and saved in PNG, GIF(recommended) or JPEG formats.