San Diego Mesa College
The Casio FX 115ES Calculator and Fractions, Mixed Numbers and DecimalsThese are the buttons we will be using to calculate fractions.263144023939500460907296614OFFONSHIFTFRACTION ?ARROW KEYSOFFONSHIFTFRACTION ?ARROW KEYSLet’s start with the basic arithmetic operations:ADDITION: 34+15 Start with 3 ? 4 right arrow Your screen should look like: 34|Continue with + 1 ? 5 right arrow = Your screen should look like: 34+ 15 1920SUBTRACTION: 13-25 1 ? 3 right arrow - 2 ? 5 right arrow = Your screen should look like: 13- 25 -115MULTIPLICATION: 54×23 5 ? 4 right arrow X 2 ? 3 right arrow = Your screen should look like: 54× 23 56DIVISION: 47÷613 4 ? 7 right arrow ÷ 6 ?13 right arrow = Your screen should look like: 47÷ 613 2621Mixed numbersThese are the buttons we will be using to calculate mixed numbers and improper factions.292855702070SHIFTFRACTIONARROW KEYSSD to accessabc dc00SHIFTFRACTIONARROW KEYSSD to accessabc dcThe answer from the division problem above was 2621, which is an improper fraction. To convert from an improper fraction to a mixed number use the SHIFT SD button to access the abcdc function.Input 26 21 right arrow SHIFT SD Your screen should look like: 26211521To convert back to an improper fraction just press SHIFT SD again.To input a mixed number, you just need to press SHIFT and the fraction key to access the mixed number option.334 is input by pressing 3 SHIFT ? 3 down arrow 4 To work with mixed numbers and proper fractions, you just need to input each using the appropriate buttons.Let’s work 214 ÷ 25 Input 2 SHIFT ? 1 down arrow 4 right arrow ÷ 2 ? 5 right arrow = Your screen should look like: 214 ÷ 25 458 SHIFT SD yields 5 58 Decimal/Fraction ConversionsThese are the buttons we will be using to work with decimal conversions.357886016516350146494513696953746501161415FRACTIONFRACTION49682401472565SDSD335915011068054697730968375ARROW KEYSARROW KEYS1252220719455542925580390SHIFTSHIFTThere are times the decimal rather than the fractional value is needed. To convert a fraction to a decimal or back the = button must be pressed before pressing SDTo change 5 58 to a decimal, input the mixed number as above: 5 SHIFT 5 down arrow 8 right arrow and then press = which changes the fraction to improper form. Now press SD and the answer will change to a decimal.Your screen should look like: 558 5.625 If you press SD again the answer reverts to the improper fraction 458.Suppose the fraction does not represent a terminating decimal?If the problem is looking for an exact answer, you are better leaving your work in fractional form.If the problem is asking for an approximate answer, you may convert to a non-termination decimal as a LAST step.Fractions which have non-terminating decimal representation are given with the line above the repeating numbers.23 becomes 0.6 57 becomes 0.714285 1712 becomes 1.416Pressing the SD again changes decimal to one with 10 decimal places rounding the answer in the last place.0.6 becomes 0.6666666667 0.714285 becomes 0.7142857143 1.416 becomes 1.416666667Pressing the SD again changes decimal back to its fractional form. These are the buttons we will be using to work percent problems.255270182245SHIFTFRACTIONARROW KEYSSD( to access %0SHIFTFRACTIONARROW KEYSSD( to access %To work a problem involving percent you will need to access the % function by first using SHIFT and then ( .To take 25% of 468: Press 25 SHIFT ( X 468 =Your screen should look like: 25%×468 117 To take 1213% of 325: Press 12 SHIFT ? 1 down arrow 3 right arrow SHIFT ( × 325 = Your screen should look like: 1213%×325 48112 This answer can be changed to the mix number 40112 by using SHIFT SD or the decimal equivalent 40.083 by using just SD.Changing from percent to fraction or decimal is possible by just inputting the percent and pressing =.Find 48% as a fraction and a decimal: 48 SHIFT ( = Your screen should look like: 48%1225 Pressing SD gives 0.48Find 5313% as a fraction and a decimal: 53 SHIFT ? 1 down arrow 3 right arrow SHIFT ( = Your screen should look like: 5313%815 Pressing SD gives 0. 53 ................
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