Its always better to be thorough with the following. This will help u in doing quick calculations. If u are proficient in this, then u can do speed calculations.

Multiplication tables - (1*15) up to (20*15)

Squares up to 25

Cubes upto 12

Powers of 2 - up to 12

Powers of 3 - upto 6

Reciprocals of numbers - upto 12

Compliments of 100 (i.e. the differance between 100 and the given two-digit number. eg- 25's compliment is 100-25 = 75)

.4\(^5\) = ?

2\(^10\) = 4\(^5\) = 1024.

.4 has one decimal place. so when its multiplied 5 times, u need to put 5 decimal places to the left of 1024.

so answer is 0.01024

same way do .25\(^4\)

25*25 = 625

625*2 = 25\(^4\) = 390625

now count the decimal points. Ans=0.390625

U are supposed to know the techniques for speed mathematics.

Once u master those techniques, then u can do a lot of lengthy calculations like multiplication of a 3 digit number with another 3 digit number, squaring a three digit number and the like in few seconds.

Shall start a new post on speed mathematics soon. if there is already a thread on that, then somebody plz attach the link here

Cleetus

_________________

If u think this post is useful plz feed me with a kudo