How to calculate Mod b in a Casio fx-991ES calculator

Question

Does anyone know how to calculate Mod b in a Casio fx-991ES calculator. Thanks

Answer 1

This calculator has no modulo function. However, there is a fairly simple way to calculate modulo the display mode ab/c (instead of the traditional d/c ).

How to switch the display mode to ab/c :

• Go to settings ( Shift + Mode ).
• Click the down arrow (to view other settings).
• Select ab/c (number 1).

Now do your calculation (in comp mode), for example 50 / 3 , and you will see 16 2/3 , so the mod will be 2 . Or try 54 / 7 , which is 7 5/7 (mod is 5 ). If you do not see any fraction, then mod 0 , like 50 / 5 = 10 (mod is 0 ).

The rest is shown in the above form , so 60 / 8 will result in 7 1/2 . Remains 1/2 , which is 4/8 , so mod is 4 .

EDIT: As @lawal correctly pointed out, this method is a bit complicated for negative numbers , because the sign of the result will be negative.

For example, -121 / 26 = -4 17/26 , so mod -17 , which is +9 in mod 26. Alternatively, you can add a base module to the calculation for negative numbers: -121 / 26 + 26 = 21 9/26 (mod is 9 ).

EDIT2: As @simpatico pointed out, this method will not work for numbers that do not match the accuracy of the calculator. If you want to calculate say 200^5 mod 391 , then some tricks from algebra are needed. For example, using the rule (A * B) mod C = ((A mod C) * B) mod C we can write:

200^5 mod 391 = (200^3 * 200^2) mod 391 = ((200^3 mod 391) * 200^2) mod 391 = 98

Answer 2

As far as I know, this calculator does not offer mod features. However, you can manually download it manually. Example.

(1) 50 mod 3

(2) 50/3 = 16.66666667

(3) 16.66666667 - 16 = 0.66666667

(4) 0.666666667 * 3 = 2

Therefore, 50 mod 3 = 2

Notes: In line 3, we got "minus 16" by looking at the result from line (2) and ignoring everything after the decimal. 3 in line (4) is the same 3 from line (1).

Hope this helped.

Edit As a result of some tests, you can get x.99991, which is then rounded to the number x + 1.

Answer 3

There is a switch a ^ b / c

If you want to calculate

 491 mod 12 

then enter 491, press a ^ b / c , then enter 12. Then you get 40, 11, 12. Here the average answer will be 11.

Similarly, if you want to calculate 41 mod 12 , then find 41 a ^ b / c 12. You will get 3, 5, 12, and the answer will be 5 (average). mod always average.

Answer 4

You can calculate A mod B (for positive numbers) using this:

Pol (-Rec ( ^1/2 _{? ^R} , 2? ^R * ^A / _B ), Y) (? ^R - Y) B

Then press [CALC] and enter your values ​​for A and B , and any value for Y.

/ indicates the use of the fraction key, and ^r means radians ( [SHIFT] [Ans] [2] )

Answer 5

Everything returns to the definition of the module: this is the remainder, for example, 7 mod 3 = 1. This is because 7 = 3 (2) + 1, in which 1 is the remainder.

To do this process on a simple calculator, do the following: Take a dividend (7) and divide it by a divisor (3), pay attention to the answer and discard all decimals → example 7/3 = 2.3333333, just worry about 2. Now multiply this number is a divisor (3) and subtract the resulting number from the original dividend.

so 2 * 3 = 6 and 7 - 6 = 1, so 1 is 7mod3

Answer 6

You need 10 ÷ R 3 = 1 This will display both a reminder and quoitent

---

÷ R

Answer 7

enter normal division first and then enter shift + S-> d

Answer 8

This is how I usually do it. For example, to compute 1717 mod 2 :

• Take 1717 / 2 . Answer: 858.5
• Now take 858 and multiply it by mod ( 2 ) to get 1716
• Finally, subtract the original number ( 1717 ) minus the number obtained from the previous step ( 1716 ) - 1717-1716=1 .

So, 1717 mod 2 - 1 .

To summarize, all you have to do is multiply the numbers to the decimal point with the mod, and then subtract it from the original number.

Answer 9

Note. Mathematical error means mod m = 0

Answer 10

Calculate x/y (your actual numbers are here) and press the ab / c key, which is in third place below Shift .