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## How To Calculate Quickly And Correctly In Mathematics - Education (7) - Nairaland

 Re: How To Calculate Quickly And Correctly In Mathematics by Nobody: 10:41pm On Nov 14, 2013 Laplacian: here's a simple proof justifying your assertion6*n=(5+1)*n=5n+n=10n/2+n....Nice work bro, keep it up, dis is exactly wat dis thread is all about...Direct extension of ur propsition shows that;4*n=(5-1)*n=5n-n=10n/2-ne.g 4*7=70/2-7=35-7=28..yes bozz. Re: How To Calculate Quickly And Correctly In Mathematics by Calculusfx: 10:21am On Nov 15, 2013 To square anything which comes between 90-100...e.g 96...say 100-96=4...subtract the 4 from 96 to give 92,square the 4 to give 16,write it together to give 9216 Re: How To Calculate Quickly And Correctly In Mathematics by MrCalculus(m): 9:02pm On Nov 20, 2013 Ortarico: If not for these busy days, I should continue as a full time administrator. My prof, I greet you powerfully. Where is my oga @ the top, 'Mr calculus'? my general i just dy low key..watching from d sidelines though Re: How To Calculate Quickly And Correctly In Mathematics by Nobody: 5:32pm On Nov 26, 2013 Maybe some of you know this shortcut ..of multiplying any integer by 7e.g7x1=10/2 +(1x2)=5+2=77x2=20/2+(2x2)=10+4=147x3=30/2+(3x2)=15+6=21 7x4=40/2+(4x2)=20+8=28and so on...Hence7xn=n'0'/2 +2n =mjust my little discovery..today.....u dont always nid calculator ..u gat it in you...Also,4x1=10/2 - 1=44x2=20/2 -2 =84x3=30/2 -3=12and so onhence4xn=n'0'/2 -n Re: How To Calculate Quickly And Correctly In Mathematics by Nobody: 6:08pm On Nov 26, 2013 Also8x1=10/2 +(1x3) =5+3=88x2=20/2 + (2x3) =10+6=168x4=40/2 +(4x3) =20+12=32and so on...Hence8xn=n0/2 +3n=malso9x1=10/2 + (1x4) =5+4=99x2=20/2 + (2x4)=10+8=189x3=30/2 + (3x4)=15+12=27 and so on.Hence9xn=n0/2 +4n=mworks for all integers (nb: 'n0' does nt mean nx0...it means introduce a zero .) See?You less need calculator since you can create one in your brain....there are lots more shotcuts in mathematics....you can finish an hour exams in less dan half the time..and have a perfect score.. Re: How To Calculate Quickly And Correctly In Mathematics by Nobody: 7:06pm On Nov 26, 2013 11x1=10+1=1111x2=20+2=2211x3=30+3=3311x4=40+4=44hence11xn =n0 +n=mand so on....you see the power of 'zero', Re: How To Calculate Quickly And Correctly In Mathematics by Nobody: 7:23pm On Nov 26, 2013 I can now conclude that12xn=n'0' +2n13 xn=n'0' +3n14 xn=n'0'+4n15xn=n'0'+5n16xn=n'0' +6n and so on.Up2 10n..Verify and try 4 other numbers.--> Re: How To Calculate Quickly And Correctly In Mathematics by Nobody: 8:01pm On Nov 30, 2013 . Re: How To Calculate Quickly And Correctly In Mathematics by Nobody: 3:19pm On Dec 07, 2013 Here Re: How To Calculate Quickly And Correctly In Mathematics by coolguyone(m): 11:03pm On Jul 12, 2014 Calculusfx: .ok...add me with mathemagician on 2go lolz Re: How To Calculate Quickly And Correctly In Mathematics by Mbahchiboy(m): 10:22am On Aug 30, 2014 .

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