What is a simple calculator called?

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Tags

1. #allows
2. #mathematics
3. #which
4. #there
5. #number
6. #different
7. #pressing
8. #people
9. #easily
10. #enter
11. #write
12. #displayed
13. #example
14. #notation
15. #calculator
16. #screen
17. #infix
18. #machine
19. #operations
20. #after
21. #called