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Sample Calculations
The following document provides a walk-through of the process for simple calculations
in Calculator. For your reference purposes, here are the Shortcut List pages:
Number Shortcuts Made Easy
Kindle Keypad
Regular Keypad
In the side-by-side comparison above, you can see that the left three columns of the
Kindle keypad correspond to the standard numeric keypad that computer users are
familiar with.
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Basic Addition/Subtraction
You can add and/or subtract a simple string of numbers and the Calculator will keep
track of the running total. The shortcut key for addition is F. The shortcut key for
subtraction is G.
Example 1: 4 + 13 = 17
Shortcut equivalent: A F ZC =
Example 2: 99 – 9 = 90
Shortcut equivalent: EE G E = 90
Example 3: 4 + 7 + 22 – 9 = 24
Shortcut equivalent: A F Q F XX G E = 24
Example 4: 121 – 48.5 + 72.3 = 144.8
Shortcut equivalent: ZXZ G AW.S F QX.C = 144.8
Basic Multiplication/Division
You can multiply and/or divide a string of number and the Calculator will keep track of
the running total. The shortcut key for multiplication is V. The shortcut key for
subtraction is B.
Example 1: 3 * 11 = 33
Shortcut equivalent: C V ZZ = 33
Example 2: 100 / 4 = 25
Shortcut equivalent: Z ↑↑ B A = 25
Example 3: 8 * 14 / 2 = 56
Shortcut equivalent: W V ZA B X = 56
Example 4: 5.2 / 4.9 * 3.4 = 3.608163265306
Shortcut equivalent: S.X B A.E V C.A = 3.608163265306
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Changing a number between positive and/or negative
The “+/-“ button is the equivalent of multiplying the current number by -1. The shortcut
key for this function is J.
This function will only affect the last number entered or calculated.
Example 1: 9.5 * 14.3 “+/-“ = 9.5 * (-14.3) = 135.85
Shortcut equivalent: E.S V ZA.C J = 135.85
Example 2: 25 “+/-“ + 98 = (-25) + 98 = 73
Shortcut equivalent: XS J F EW = 73
Percentage
The percentage key “%” can be used to help calculate percentages. The shortcut key
for this button is R.
Addition Example – Total with Tax: If you are buying a book in the Amazon Kindle store
for $6.99 and you know that they charge 6.80% sales tax for internet purchases in the
state of Utah, you can determine the final charge by entering 6.99 + 6.8 % to find you
will be charged $7.47 (ok – they round the 7.46532 up a bit) for your new book.
Shortcut equivalent: D.EE F D.W R = 7.46532
Addition Example – Total with Tip: If your dinner tab is $35 and you want to know what
your total bill should be including a 15% tip, enter 35 + 15% to determine you should
pay $40.25 (and then use Calculator to add on the designated tax).
Shortcut equivalent: CS F ZS R = 40.25
Subtraction Example – Discount Price: You found a great sale on a jacket that was
originally priced at $119.55 and is discounted at 25%. To find the discounted price,
enter 119.55-25% and see that the shirt now sells for $89.66 (rounded down from
89.6625).
Shortcut equivalent: ZZE.SS G XS R = 89.6625
Multiplication Example - Straight Percentage: You donate 10% of your paycheck to a
favorite charity and want to know how much to contribute if you bring home $1898.75
twice a month. To determine your donation amount, enter 1898.75*10% and find you
should contribute $189.875 which you round to $189.88.
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Shortcut equivalent: ZWEW.QS V Z↑ R =
Division Example: 200/25% is the same as dividing 200 by (25% of 1) = 200 / 0.25 =
800.
Shortcut equivalent: X↑↑ B XS R = 800
Square Root
The square root key (√) can be used to determine the square root of the entered
number or calculated result. The shortcut key for this button is T.
Example 1: To find the square root of 25 (or √25) enter 25 T = 5
Shortcut equivalent: XS T = 5
Example 2: To find the square root of 13.5 * 12 ( or √(13.5*12) ) enter 13.5*12 = T =
12.727922061357855 (it is necessary to enter = after the initial calculation before
determining the square root).
Shortcut equivalent: ZC.S V ZX = T = 12.727922061357855
Note: Trying to find the square root of a negative number will return the response of
“Impossible to calculate”
Powers or Exponents
The “x^y” button allows you to calculate problems using powers/exponents. “x^y” is the
equivalent of x to the power of y. The shortcut key for this button is P.
Example 1: To calculate 5^2 (or 5*5) enter 5 x^y 2 = 25
Shortcut equivalent: S P X = 25
Example 2: To calculate 2^3 (or 2*2*2) enter 2 x/y 3 = 8
Shortcut equivalent: X P C = 8
Example 3: To calculate -5^5 (or -5*-5*-5*-5*-5) enter 5 +/- x^y 5 = -3125
Shortcut equivalent: S J P S = -3125
1/X
The “1/x” button quickly allows you to divide 1 by a number. The shortcut key for this
button is O.
Example 1: To find1/4, enter 4 “1/x” = 0.25
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Shortcut equivalent: A O = 0.25
Example 2: To find -1/3, enter 3 “1/x” “+/-“ = -0.333333333333333
Shortcut equivalent: C O J = -0.333333333333333
Note: Trying to divide 1/0 will return the response of “Can not divide by zero.”
SIN
The SIN button will produce the calculated Sine in Radians of the entered number.
Example: to find the Sine of 75º enter 75 SIN. Result = -0.387781635409
Shortcut equivalent: QS SIN = -0.387781635409
COS
The COS button will produce the calculated Cosine in Radians of the entered number.
Example: to find the Cosine of 100º enter 100 COS. Result = 0.862318872288
Shortcut equivalent: Z ↑↑ COS = 0.862318872288
TAN
The TAN button will produce the calculated Tangent in Radians of the entered number.
Example: to find the Tangent of 33º enter 33 TAN. Result = -75.313014800085
Shortcut equivalent: CC TAN = -75.313014800085
Chain Calculations
Chain Calculations can be easily done in Calculator. 5^4/3 (5 to the fourth power
divided by 3) is the same as taking 5^4 and then dividing the answer by 3.
Shortcut equivalent: S P A B C = 208.33333333333334
Some chain calculations will need to use the Memory functions.
If you wanted to calculate out 5^(4/3) (5 to the 4/3 power) you would need to calculate
out 4/3 and store this answer in memory (4 / 3 M stores this number in memory) and
then enter 5^N to arrive at the correct answer (N returns the number stored in memory).
Shortcut equivalent: (Step 1) A B C M (you will see the message “Memory now holds
1.333333333333333”) (Step 2) S P N = 8.54987973338348
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