1. Square of two digit number ending with 5.
To square a two digit number ending with 5, follow this trick.
Multiply the first digit by itself, add one to it and put 25 at the end.
2. Multiplication by 11
No matter how long a number is, now you can multiply it by 11 within a few seconds.
3. Nine times table
Learn the table of 9 by writing a countdown from 0 to 9 at ones place and reverse countdown from 9 to 0 at tens place.
4. To find percent value.
Divide both the numbers by 10 and multiply the result figures.
5. Multiplication by 5
To multiply any complex number by 5, half the given number and add 0 (if it is a whole number) or 5(if it is a fraction) at the end.
6. Multiplication by 12
To multiply any number by 12, double the last digit and thereafter double each digit and add the answer to its successor digit.