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1% = 1/100 = 0.01 (if two zeros are given, just move the decimal pointer two places left)
2% = 2/100 = 0.02 = 1/50 (the simplification of 2/100)
3% = 3/100 = 0.03
4% = 4/100 = 0.04 = 1/25
5% = 5/100 = 0.05 = 1/20
6.25% = 6.25/100 = 0.0625 = 1/16
7% = 7/100 = 0.07
7.5% = 7.5/100 = 0.075
10% = 10/100 = 0.1 = 1/10
12.5% = 12.5/100 = 0.125 = 1/8
20% = 0.2 = 1/5
21% = 0.21
25% = 0.25 = 1/4
30% = 0.3 = 3/10
33.33% = 33.33/100 = 0.3333 = 1/3
37.5% = 0.375 = 3/8
40% = 0.4 = 2/5
50% = 0.5 = 1/2
60% = 0.6 = 3/5
62.5% = 0.625 = 5/8
66.66% = 66.66/100 = 2/3
75% = 0.75 = 3/4
80% = 0.8 = 4/5
87.5% = 0.875 = 7/8
100% = 1
125% = 1.25 = 1 1/4
150% = 1.5 = 1 1/2
200% = 2
please elaborate 0.625*100
ReplyDeletemake the decimal "hop"
Deletesince there are 2 0s,hop the decimal from its current position to next-to-6
hop it again to next-to-2.
so we get 62.5
and thats the answer.
62.5
ReplyDeleteawsome
ReplyDeletethanks for provide us all tricks
ReplyDeleteDear sir/Madam.
ReplyDeleteI appreciate your work. You have provided us a platform where we can learn many thing related to Competition Exams..Really this is very good efforts to provide us good material..
I am Thankful to you..
I have some tricks of Maths calculation of squares.
regards,
Ashish
You are always welcome to share your tricks with us Ashish. You can mail us to "Gr8AmbitionZ(at)Gmail.com"
DeleteThanks for the concern :)
i like the 'decimal hop' technique,its easy to use wen one is able 2 visualize it.i mean shifting the decimal by the number of places which is equal to the number of zeros,to left or to the right depending on wether we are multiplying or dividing.
ReplyDeletelike,
6.25 * 100=625 means we will hop the decimal 2 times(as number of zeros=2) to the right(as we are multiplying)
62.5/100=0.625 means we will hop the decimal 2 times(as number of zeros=2) to the left(as we are dividing)
Thnx Maggie
Deletethanx madam,but madam can you please clear my doubts i have doubts in 12.5%,33.33% & 66.66% can u please explain me these three?
ReplyDeleteany way X%means X/100 So
Delete12.5% = 12.5/100=>0.125
33.33%= 33.33/100=>0.3333
and is also same...........