1. *

2. *
*150+150 = *300
*120-20= *100
*50+50+50-50= *100

3. *
*
*
*
*

4. *
* Start --> programs -->
Accessories -->
Calculator

5. * Calculator (Standard)

6. *

7. *
*
C Esc
CE Del Delete
Backspace Backspace

8. *
*
MS Ctrl+M
M+ Ctrl+P
MR Ctrl+R
MC Ctrl+L

9. *
*
View --> Scientific

10. *
* Calculator
* Taskbar
Calculator Close Alt+F4

11. *
* Calculator
1. 5+10 = 15
2. 905 - 190 = 755
3. 5098 + 1980 = 3118
4. 89695 + 109890 = 199585
5. 98085 - 9870 = 88215

12. *
* Calculator
6. 88765 + 8910 = 97675
7. 9000 / 10 = 900
8. 98995 - 19870 = 79125
9. 589 + 180 = 1138
10. 898885 + 189980 = 1088865