learn trignometric table

1.write 0,30,45,60,90 in 1st row
2.sin,cos,tan in column 
3. write 0,1,2,3,4 in front of sin under respective column of step 1
4. divide the step 3 values by 4 
5. take under root of step 4

Cos is reverse of sin [start from right of sin values

mnemonics : Learn sequence of Nine planets

the nine planets in order:
Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, Neptune, and Pluto

My Very Educated Mother Just Served Us Nine Pizzas:
Many Very Energetic Men Jump Sideways Under Nelly Parker
My Very Excellant Memory Just Stores Up Nine Planets.
My very easy method just set up nine planets
My Very Educated Mother Just Showed Us Nine Planets!
Many voters earn money just showing up near polls
Artha Visits Every Monday And Just Sits Until Noon Period
Many Very Early Mornings Julie Sits Up Naming Planets
Mary's Violet Eyes Make Johnny Stay Up Nights Period
My Valet Edward Makes Juicy Sandwiches Using Needles & Pins

mnemonics:Learn light spectrum in decreasing frequency order or increasing wavelength order

violet, indigo, blue, green, yellow, orange and red 

Virgin In Bed Gives You Orgasmic Release
Virgin In Bed: Get Your Organ Ready!
In reverse order
Rip Off Your Goolies Before I Vomit
Richard of York gave battle in veginia
Read Out Your Good Book In Verse

learn a trignometric formula

Some People Have Curly Brown HairTurned Permanently Black
S = P/H
Sin = Perpendicular / Hypotenuse
Curly Brown Hair
C = B/H
Cos = Base/Hypotenuse
Turned Permanently Black
T = P/B
Tan = Perpendicular/Base

pandit bhadri parsad har har bole sona chandi tole
perpendicular base perpendicular
(p) (b) (p)
hypotenuse hypotenuse base
(h) (h) (b)
sine cosine tangent
(s) (c) (t)

Sin = P/H, Cos = B/H, Tan = P/B 

Some people have curly brown

hair turned permanantly black.

Some People Have
Curly Black Hair 
Through Proper Brushing

Maths Trick Time taken to double the money

You might have heard about time taken to double your invested money in X no. of years when agents are marketing about their product instead of straight away telling about effective rate of interest.

So i am sharing you a trick to calculate rate of interest to double the amount if you know the time or
vice versa in a matter of 3 seconds.

Scope of formula :
applicable to compound interest
gives you a rough idea may or may not be accurate
Applicable to double the amount

(Time taken to double Invested money) X (Rate of interest) = 72

Formula Check
rate of interest be 10 % annualy, Investment amount Rs. 100000
using formula
= 72 / Rate of interest
= 72/10
= 7.2 years

Amount = p  [(1+R%)^t]
=100000 [(1+10/100)^7.2]

Formula Pass

If like the trick say Thanks 

Percentage - Net Discount after series of discounts

Net Discount after series of discounts
Net Discount= (1- 1st discount%) X (1-2nd disscount %) and so on
Discount on shirt 10% on 30%

Net discount = (1-0.1)(1-0.3)=(0.9*0.7)=0.63
or say 63 % net discount

Lets check this formula on shirt mrp 100 Rs.

After First Discount

After Second Discount

Percentage Change = Price After Discount / Original Price *100