GSP PEDAGOGICAL EXPLANATION & USER MANUAL

First of all the Geometer's Sketchpad (GSP) takes the traditional pencil-and-paper geometry class and transforms it into a dynamic learning environment. By using the tool's dragging features, students can observe countless examples of different figures quickly and easily. With GSP, the classroom becomes a student-centered rather than teacher-centered environment. Students in this environment feel a sense of control over their learning, even when the teacher is the person designing the sketches. (Gray,2008)

Decimal numbers are quite abstract and difficult to comprehend in detail demonstration, students have difficulties when exact understanding is concerned. Hence, Geometer Sketchpad facilitates really to see and analyze explicitly each digit. Hence. the project which includes the detailed demonstration of decimal numbers makes more easier to stimulate association especially between decimal parts of number.

In the Project of decimal numbers, there is a number line a point could move freely on the line. Students encounter firstly with demonstration, reading and writing  of decimal numbers in 5^th grade after topic of rational numbers. In 6^th grade, they learn to analyze decimal numbers and round up to digit wanted, and repeating decimals in 7^th and square root of decimals in 8^th grade. The Project could be made adaptation with necessery for each level student according to curriculum and instruction.

Our Project gives a chance for students to interpret the decimal number in details and uto see where the point takes place in the number line when the digits change. Furhermore, students can also realize that a decimal number is actually a number which has not only unit digits but also tenths, hundreths and thousanths digits. 

USER MANUAL

In our Project, there is a number line and point moved on, also buttons called as "Yaklaş", "Yerini Göster", "Nokta Nesnesini Hareketlendir", "Sıfırla". Immediately under that number line there is a button , and when the user presses on that button one another number line exists and this one the number line would be more detailed in terms of the units such as tenths, hundreths,thousandhs. 
The distinction among the numerical axises is shifting of the place of the point due to  there should be a new numberical axis exists in every digit. Learners have the occasion to examine the number in details and have chance to see where the point takes place in the number line when the digits change by this program. In addition to these, students can also realize that a decimal number is actually a number which has not only units digit but also tenths, hundreths and thousanths digits.
Also, there is a red point on the first level number segment which constructed with unit digits and symbolizes a decimal number and the aim is to state the place of that point. To use of the program, you can use steps below;

1. First screen when the program begin has a first level number line and a point moving freely on its. Also, there are "Yakınlaş" butons that work for extending decimal parts. When you press these button, you will see other lines that represent next decimal digit explicitly. 
2. Also, the implementation has an “ Noktayı Hareketlendir” buton that provides learners to move the red circled point to the wanted location in the first level number line. Furtheremore, after pressing to all “yakınlaş” buttons all level number lines will be exist with their extended forms and you can also press on “ noktayı hareketlendir” buton and can see all points change in different levels in which they take place and change according to the red point in the 1st number line.

3. The buton called as “Başlangıç Değeri provides learners to determine their start point that they want and after writing the wanted starting point and pressing to that button, the boundaries will automatically shift according to that starting point and by the way users can analyze and see each decimal number in detail. 

4. After such a training, if you want to analyze another demonstration about decimal numbers, you should press on “sıfırla” buton. After pressing that buton the program will reset all made actions and you can start from the beginning again. Users can do the same thing again again and this provides students the opportunity to make practice about estimating the true decimal number.