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Q. Contractile vacuole is meant for - JAM-1991
To calculate the HCF of two numbers.
Eg:- HCF of 411 and 417? Ans:- 3
A quick way to square numbers that end in 5.
752 = 5625
multiplication of numbers near a base (10, 100, 1,000 etc)
eg:- 96*92
Here is a nice simple way to add hours and minutes together
eg:-Add 1 hr and 35 minutes and 3 hr 55 minutes
ans:- 5 hr and 30 minutes
Factorization of polynomial expressions of two or more variables
eg:- Factorise p(x,y,z)=2x2+6y2+3z2+7xy+11yz+7xz=(2x+3y+z)(x+2y+3z)