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

Question

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

User · Answer

You can calculate A mod B  for positive numbers  using this   Pol  -Rec  1 2 pi r   2 pi r  times  A B     Y      pi r - Y   B  Then press  CALC   and enter your values for A and B  and any value for Y     indicates using the fraction key  and r means radians    SHIFT   Ans   2

User · Answer

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 will get 40  11  12  Here the middle one will be the answer that is 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 is 5  the middle one   The mod is always the middle value

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It all falls back to the definition of modulus  It is the remainder  for example  7 mod 3   1  This because 7   3 2    1  in which 1 is the remainder   To do this process on a simple calculator do the following  Take the dividend  7  and divide by the divisor  3   note the answer and discard all the decimals -  example 7 3   2 3333333  only worry about the 2  Now multiply this number by the divisor  3  and subtract the resulting number from the original dividend   so 2 3   6  and 7 - 6   1  thus 1 is 7mod3

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Calculate x y  your actual numbers here   and press a b c key  which is 3rd one below Shift key

User · Answer

This calculator does not have any modulo function  However there is quite simple way how to compute modulo using display mode ab c  instead of traditional d c    How to switch display mode to ab c    Go to settings  Shift   Mode   Press arrow down  to view more settings   Select ab c  number 1     Now do your calculation  in comp mode   like 50   3 and you will see 16 2 3  thus  mod is 2  Or try 54   7 which is 7 5 7  mod is 5   If you don t see any fraction then the mod is 0 like 50   5   10  mod is 0    The remainder fraction is shown in reduced form  so 60   8 will result in 7 1 2  Remainder is 1 2 which is 4 8 so mod is 4   EDIT  As  lawal correctly pointed out  this method is a little bit tricky for negative numbers because the sign of the result would be negative   For example -121   26   -4 17 26  thus  mod is -17 which is  9 in mod 26  Alternatively you can add the modulo base to the computation 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 are out of calculator s precision  If you want to compute say 200 5 mod 391 then some tricks from algebra are needed  For example  using 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

User · Answer

As far as I know  that calculator does not offer mod functions  You can however computer it by hand in a fairly straightforward manner  Ex    1 50 mod 3   2 50 3   16 66666667   3 16 66666667 - 16   0 66666667   4 0 66666667   3   2  Therefore 50 mod 3   2  Things to Note  On line 3  we got the  minus 16  by looking at the result from line  2  and ignoring everything after the decimal  The 3 in line  4  is the same 3 from line  1    Hope that Helped   Edit  As a result of some trials you may get x 99991 which you will then round up to the number x 1

User · Answer

type normal division first and then type shift   S- d

User · Answer

Simply just divide the numbers  it gives yuh the decimal format and even the numerical format  using S lt - gt D For example  11 3 gives you 3 666667 and 3 2 3  Swap using S lt - gt D   Here the  2  from 2 3 is your mod value  Similarly 18 6 gives you 14 833333 and 14 5 6  Swap using S lt - gt D   Here the  5  from 5 6 is your mod value

User · Answer

Note  Math error means a mod m   0

User · Answer

You need 10   R 3   1 This will display both the reminder and the quoitent       R

User · Answer

Here s how I usually do it   For example  to calculate 1717 mod 2    Take 1717   2   The answer is 858 5 Now take 858 and multiply it by the mod  2  to get 1716 Finally  subtract the original number  1717  minus the number you got from the previous step  1716  -- 1717-1716 1    So 1717 mod 2 is 1   To sum this up all you have to do is multiply the numbers before the decimal point with the mod then subtract it from the original number

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

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