Casio FX260HA User Manual download pdf (Page 5)

Important Points to Remember!

1. The Casio fx-260 Solar Scientific calculator performs operations in the correct order. However, it is important to

understand the basic principles involved, especially when you want to check your calculations using paper and

pencil. The mnemonic expression “Please Excuse My Dear Aunt Sally” is an excellent device to help you

remember the correct order of operations.

P – Parentheses and other grouping symbols, innermost first,

E – Exponents and square roots,

M, D – Multiplication and Division in order from left to right, then

A, S – Addition and Subtraction, in order from left to right.

2. To be sure that you are starting clear for a new problem ALWAYS press the ON or AC keys prior to starting

calculations.

3. To be sure that your answer showing on the screen is the final answer, ALWAYS press = key to end the

calculation.

4. Use estimation to check answers for reasonableness.

5. Problems including fractions and decimals will always have a decimal answer.

6. To change a fractional answer into a decimal, after completing the calculation and pressing the = key, press

the

. The final answer will appear as a decimal.

7. When evaluating fractions, placing separate parentheses around the numerator and the denominator will help

keep the correct order of operation.

8. Unless it occurs in the first position, any grouping symbol

must be preceded by an operational symbol. When no

symbol is present, it is understood to be multiplication.

9. The most important thing that you can do as the GED student is to use plenty of practice time. Use the calculator

to solve real-life problems. Extend activities beyond the classroom and use the Casio fx-260 Solar Scientific

calculator at home or in the workplace.

10. Last, but certainly not least,

PRACTICE, PRACTICE, PRACTICE!!!

Appendix B4—The Casio fx-260 Solar Calculator Guide B–11

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Casio FX260HA User Manual Page 5