Windows – Alt Key Numeric Codes – 4: Math Symbols and Fractions

by Prashant Kumar Sharma

Alt-Key Numeric Codes of Math Symbols and Fractions

Microsoft Windows assigns a Unique numeric code to each accented letters, foreign characters and special mathematical symbols. The shortcut to manually insert these letters and symbols is ALT key input on Keyboard and calling the specific numeric code assigned to them.

Here is a list of common Math Symbols and Fractions, to determine the numeric code.

÷ Division sign 0247
° Degree symbol 0176
¬ Not symbol 0172
± Plus/minus 0177
µ Micro 0181
Per Mille (1/1000th) 0137
¼ Fraction 1/4 0188
½ Fraction 1/2 0189
¾ Fraction 3/4 0190

How to use the codes:

1. Place your cursor in the location where you wish to insert a special character.
2. Activate the numeric key pad on the right of the keyboard by pressing Num Lock (upper right of keyboard). The Num Lock light on the keyboard will indicate that the numeric key pad is on.

NOTE: You must use the numeric key pad; if you use the number keys on the top of the keyboard, the characters will not appear. If you are on a laptop or computer without a separate numeric keypad one of the other methods is recommended.
3. While pressing down the ALT key, type the four-digit code on the numeric key pad at the right edge of the keyboard. The codes are “case sensitive.” For instance, the code for lower-case á is ALT+0225, but capital Á is ALT+0193.

NOTE: If you have the International keyboard activated, you will only be able to input codes with the ALT key on the left side of the keyboard.
4. Release the ALT key. The character will appear when the ALT key is released.

NOTE: You must include the initial zero in the code. For example to insert á (0225) you must type ALT+0225, NOT ALT+225.


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