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Friday, December 9, 2011

Easy Maths and Calculation Secrets Simplified Exam...2

Using VERTICALLY AND CROSSWISE you do not need the multiplication tables beyond 5 X 5. Suppose you need 8 x 7
8 is 2 below 10                   and                     7 is 3 below 10. Think of it like this:

8x7=

8   2
7   3
------
5   6        ( 8-3=5=7-2)    ( 2x3=6)


9x9     (9-1=8    1x1=1)   and answer is 81

it is better than you remembered multiplication table


Here's how to use VERTICALLY AND CROSSWISEfor multiplying numbers close to 100

take standard 100 and move on

88x98=    88=100-2    98=100-2

88-2=86   or  98-12=86  12x2= 24

ans is 8624

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A clock shows the time as 6 a.m. If the minute hand gains 2 minutes every hour, how many minutes will the clock gain by 9 p.m.?


9 pm = 12+9th hr=21st hour 


time diff= 21-6=15 
and got min = 15*2= 30


and in one line solution =    (12+9-6)x 2=30


 Find the right number, from the given options, at the place marked by the question mark: 2, 4, 8, 32, 256, ?


first test power of two and series of power   1,2,3,5,8  but slight complex,it is true ( check later and deeper)
so left it
2x4=8
8x4=32
8x32=256
so next is 256x32= 256x4x8 = 1024x8= 8192
















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