INSTRUCTIONS
Subtract With Lines uses number lines to demonstrate subtraction of fractions.
You can input the minuend and subtrahend for a subtraction of fractions example. The minuend must be less than 7 and larger than the subtrahend.
Press the <OK> button and the number lines for the minuend, subtrahend and the difference number lines will appear.
Suggestions:
Start with a common denominator such as 3 3/4 and 2 1/4. Notice how the difference extends from the end of the subtrahend to end of the minuend.
Then enter 3 3/4 and 2 1/2 to see how the common denominator of 4 is used. If you continue to decrease the size of the subtrahend by fourths from 2 1/2 and then to 2 1/4 etc., you will notice the difference increasing.
Enter 3 0/1 for the minuend and 2 2/3 for the subtrahend. Notice that the minuend has been renamed to 2 3/3 to subtract. Decreasing the whole number in 3 by one will give you 2 3/3, allowing you to subtract the whole numbers and the numerators.
Try 3 1/3 minus 2 2/3. Notice that the minuend has been renamed to allow you to subtract the numerators.
If the minuend numerator is smaller than the subtrahend numerator, the example will show how to borrow. Make sure that denominators are the same if you want to demonstrate an example like 3 - 1 3/ 4. To do this enter 3 0/4 - 1 3/4.
On the left is a <COLOR OFF> button. This button toggles with <COLOR ON>, turning off the color in the difference. This will allow the student to demonstrate the size of the difference.
<EXPLAIN OFF> will turn the explanation off, allowing the teacher or student to demonstrate how the difference is found.
WINDOWS COMPUTERS
You may copy the screen by pressing <Print Screen> on the keyboard. This copies the screen into Windows Clipbboard™. The screen can then be pasted into Windows Paint™ or your favorite imaging program. Windows Paint™ will allow you to select any part of the image to be printed or saved,
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.
