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    <p>This calculator does not have any modulo function. However there is quite simple way how to compute modulo using display mode <code>ab/c</code> (instead of traditional <code>d/c</code>).</p> <p>How to switch display mode to <code>ab/c</code>:</p> <ul> <li>Go to settings (<kbd>Shift</kbd> + <kbd>Mode</kbd>).</li> <li>Press arrow down (to view more settings).</li> <li>Select <code>ab/c</code> (number 1).</li> </ul> <p>Now do your calculation (in comp mode), like <code>50 / 3</code> and you will see <code>16 2/3</code>, thus, mod is <code>2</code>. Or try <code>54 / 7</code> which is <code>7 5/7</code> (mod is <code>5</code>). If you don't see any fraction then the mod is <code>0</code> like <code>50 / 5 = 10</code> (mod is <code>0</code>).</p> <p>The remainder fraction is shown in <strong>reduced form</strong>, so <code>60 / 8</code> will result in <code>7 1/2</code>. Remainder is <code>1/2</code> which is <code>4/8</code> so mod is <code>4</code>.</p> <p>EDIT: As @lawal correctly pointed out, this method is a little bit <strong>tricky for negative numbers</strong> because the sign of the result would be negative.</p> <p>For example <code>-121 / 26 = -4 17/26</code>, thus, mod is <code>-17</code> which is <code>+9</code> in mod 26. Alternatively you can add the modulo base to the computation for negative numbers: <code>-121 / 26 + 26 = 21 9/26</code> (mod is <code>9</code>).</p> <p>EDIT2: As @simpatico pointed out, this method will not work for numbers that are out of calculator's precision. If you want to compute say <code>200^5 mod 391</code> then some tricks from algebra are needed. For example, using rule <code>(A * B) mod C = ((A mod C) * B) mod C</code> we can write:</p> <p><code>200^5 mod 391 = (200^3 * 200^2) mod 391 = ((200^3 mod 391) * 200^2) mod 391 = 98</code></p>
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    1. POHow to calculate a Mod b in Casio fx-991ES calculator
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    1. COWhat about 200^5 mod 391?
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    2. CO@simpatico because 200^5 is out of range of calc's precision you need to use some tricks from algebra. For example: 200^5 mod 391 = (200^3 mod 391) * 200^2 mod 391 = 98 (you can use mod at 'any time' during computation).
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