Amazing Math Trick234X234+1234-875=???Trick! Trick! The 7-11-13 trick!This trick makes y! "k "ike y!r #rain is a mega $ast ca"c!"atr! Ask a $rien% t &rite %&n A'( three %igit n!m#er s!ch as 231 r 884) Ask them t m!"ti*"y the n!m#er #y + 7+ 11+ 13)))#!t e,en i$ y!r $rien% has !se% a ca"c!"atr- y! &i"" ha,e &ritten %&n the ans&er ages ag! .t/s 0en%ish!THE SECRET: a"" y! % is &rite !t the starting n!m#er t&ice! 1 231 &i"" #ecme 231231 an% 884 &i"" #ecme 884884) (! %n/t #e"ie,e it? 2e"" try it n this ca"c!"atr an% see $r y!rse"$! (! &rk this ca"c!"atr #y c"icking the m!se n the #!ttns) 3 n- *!t in A'( three %igit n!m#er then +7 +11 + 13 an% see &hat y! get! The 3367 trick:This trick is simi"ar t the 7-11-13 trick) .t/s har%er t %- #!t it "ks $ar mre mirac!"!s! 3et a $rien% t *ick any 2 %igit n!m#er e)g) 74 + 3347 T &rk !t the 0na" ans&er y! ha,e t imagine the rigina" n!m#er &ritten !t three times e)g) 747474 then %i,i%e it #y three) 245158 This ne takes *ractice- #!t !n"ike the thers- it/s ,ery har% t see h& it/s %ne! The MISSING DIGIT trick!6ere it is! 3 an% hi%e in a c!*#ar%- r c,er y!r eyes in sme &ay s that y! can/t see &hat y!r $rien% is &riting) Ask a $rien% t secret"y &rite %&n A'( n!m#er 7at "east $!r %igits "ng8) e)g) 78341 Ask the $rien% t a%% !* the %igits))) e)g) 7+8+3+4+1 = 23 ))) an% then s!#tract the ans&er $rm the 0rst n!m#er) e)g) 78341 - 23 = 78318 (!r $rien% then crsses !t 9': %igit $rm the ans&er) 7.t can #e any %igit e+ce*t a zer8 e)g) 7+318 (!r $rien% then rea%s !t &hat %igits are "e$t )e)g) 7-3-1-8 :,en th!gh y! ha,en/t seen any n!m#ers- y! can say &hat the missing %igit is! :.36T THE SECRETThis great trick re"ies n the *&er $ 5) A$ter y!r $rien% has a%%e% !* the %igits an% s!#tracte% them- the ans&er &i"" A;2A(1 %i,i%e #y 5) .$ a n!m#er %i,i%es #y nine- then &hen y! a%% the %igits !*- they &i"" a"s %i,i%e #y 5) .$ y! check !r e+am*"e 7+8+3+1+8 = 27 &hich %es %i,i%e #y nine) 2hen y!r $rien% crsses a %igit !t- he then rea%s !t the %igits that are "e$t) (! a%% them !*) .n the e+am*"e &e ha% 7+3+1+8 = 15 A"" y! % n& is see &hat y! ha,e t a%% n t y!r ans&er t get the ne+t n!m#er that %i,i%es #y nine! The ne+t n!m#er t %i,i%e #y 5 a$ter 15 is 27) 1 y! nee% t a%% n :.36T) This is the n!m#er that &as crsse% !t! !a" a$ter each ste*) 3 ahea% an% try the trick &ith!t cheating! ?r a sim*"e- n"ine =a,a1cri*t ca"c!"atr- c"ick n the ca"c!"atr #!ttn) 1) A%% 18 t y!r #irth mnth 2) M!"ti*"y #y 25 3) 1!#tract 333 4) M!"ti*"y #y 8 5) 1!#tract 554 4) @i,i%e #y 2 7) A%% y!r #irth %ate 8) M!"ti*"y #y 5 5) A%% 4521A) M!"ti*"y #y 2A11) A%% n"y the "ast t& %igits $ y!r #irth year12) 1!#tract 3254A t get y!r #irth%ay! The ans&er/s $rmat isB mnthC%ayCyear) ?r e+am*"e- an ans&er $ 123155 means that y! &ere #rn n @ecem#er 31- 1555) .$ the ans&er is nt right- y! $""&e% the %irectins incrrect"y r "ie% a#!t y!r #irth%ay) The "24" Mystery! M!r"er#!s M$th %$& c$''e" ()ID *#i&te" #!t th$t i% y#! s+!$re N, *ri-e &!-.er .i//er the& 30 the& s!.tr$ct 10 the $&s1er $'1$ys "i2i"es .y 24! E3/3 112 4 121 the& 121 - 1 4 125 $&" yes 125 "#es "i2i"e .y 243 6H,7 I% y#! !&"erst$&" $'/e.r$0 8$&" y#!92e re$" The :h$&t#- ; < the& y#!9'' k th$t $'' *ri-e &!-.ers c$& .e 1ritte& $s 86&=1< #r 86&-1!are the 0rst %igit) A%% this n!m#er t the secn% n!m#er t 0n% the 0rst *art $ the ans&er) 1>!are the secn% %igitB this is the "ast *art $ the ans&er) E>$-*'e:.$ the n!m#er is D@- m!"ti*"y 5 P 5 = 25 7s>!are the 0rst %igit8) 25 + 8 = 33 725 *"!s secn% %igit8) The 0rst *art $ the ans&er is 333 3 Q Q 8 P 8 = 44 7s>!are secn% %igit8) The "ast *art $ the ans&er is 44 Q Q 4 4 1 D@ F D@ 4 3364) See the *$tter&7 ?r 53 P 53- m!"ti*"y 5 P 5 = 25 7s>!are the 0rst %igit8) 25 + 3 = 28 725 *"!s secn% %igit8) The 0rst *art $ the ans&er is 282 8 Q Q 3 P 3 = 5 7s>!are secn% %igit8) The "ast *art $ the ans&er is A5Q Q A 5 1 D3 F D3 4 2@5G) S+!$ri&/ $ 2-"i/it &!-.er e&"i&/ i& DGhse a 2-%igit n!m#er en%ing in 5) M!"ti*"y the 0rst %igit #y the ne+t cnsec!ti,e n!m#er) The *r%!ct is the 0rst t& %igitsB XX Q Q) The "ast *art $ the ans&er is a"&ays 25B Q Q 2 5) E>$-*'e:.$ the n!m#er is 3D- 3 P 4 = 12 70rst %igit times ne+t n!m#er8) 1 2 Q Q The "ast *art $ the ans&er is a"&ays 25B Q Q 2 5) 1 3D F 3D 4 122D) See the *$tter&7 ?r 45 P 45- 4 P 7 = 42 70rst %igit times ne+t n!m#er8B 4 2 Q Q) The "ast *art $ the ans&er is a"&ays 25B Q Q 2 5) 1 6D F 6D 4 422D) S+!$ri&/ &!-.ers -$"e !* #% si>esGhse a a n!m#er ma%e !* $ si+es) The s>!are is ma%e !* $B ne $e&er 4 than there are re*eating 4/s 3 same n!m#er $ 5/s as 4/s 4 E>$-*'e:.$ the n!m#er t #e s>!are% is 666 The s>!are $ the n!m#er hasB 4/s 7ne "ess than %igits in n!m#er8 4 43 35/s 7same n!m#er as 4/s8 5 54 41 666 F 3666333 4 443DD6) See the *$tter&7 .$ the n!m#er t #e s>!are% is 66666 The s>!are $ the n!m#er hasB 4/s 7ne "ess than %igits in n!m#er8 4 4 4 43 35/s 7same n!m#er as 4/s8 5 5 5 54 41 66666 F 66666 4 44443DDDD6) M!'ti*'y H* t# 25;25 I& ,#!r He$"I& I!st ?IJE -i&!tes y#! sh#!'" 'e$r& t# +!ick'y -!'ti*'y !* t# 25>25 i& y#!r he$"3 2ith this trick- y! &i"" #e a#"e t m!"ti*"y any t& n!m#ers $rm 11 t 15 in y!r hea% >!ick"y- &ith!t the !se $ a ca"c!"atr) . &i"" ass!me that y! kn& y!r m!"ti*"icatin ta#"e reasna#"y &e"" !* t 1A+1A) Try thisBTake 15 + 13 $r an e+am*"e) A"&ays *"ace the "arger n!m#er $ the t& n t* in y!r min%) Then %ra& the sha*e $ A$rica menta""y s it c,ers the 15 an% the 3 $rm the 13 #e"&) Thse c,ere% n!m#ers are a"" y! nee%) ?irst a%% 15 + 3 = 18 A%% a zer #ehin% it 7m!"ti*"y #y 1A8 t get 18A) M!"ti*"y the c,ere% "&er 3 + the sing"e %igit a#,e it the N5N 73+5= 158 A%% 18A + 15 = 155) Th$t is It! 6$s&9t th$t e$sy7 :r$ctice it #& *$*er Crst! The 11 R!'e,#! 'ike'y $'' k the 15 r!'e 8t# -!'ti*'y .y 150 I!st $"" $ 5 .ehi&" the &!-.er< .!t "# y#! k the 11 r!'e7 It is $s e$sy! ,#! sh#!'" .e $.'e t# "# this #&e i& y#! he$" %#r $&y t1# "i/it &!-.er3 :r$ctice it #& *$*er Crst! T# -!'ti*'y $&y t1# "i/it &!-.er .y 11: ?#r this e>$-*'e 1e 1i'' !se D43 Se*$r$te the t1# "i/its i& y#! -i&" 8DKK4