## MSC #17- By Alternate Elimination and Retention

For the 17th MATH-Inic Special for Christmas, we are introducing the Vedic Math sub-Sutra, “By Alternate Elimination and Retention”.  In order to simplify solution of some problems, we sometimes ignore or temporarily eliminate some variables and retain only the others.…

## MSC #16 – Divisibility: Extending the Divisibility Rule for 9

The divisibility rule for 9 can be extended for divisors composed entirely of 9s like 99, 999, 9999 etc. The rule for 9 is that “If the sum of the digits of the number is divisible by 9, then the…

## MSC #15 – Divisibility: By Addition and by Subtraction

Our 15th MATH-Inic Special for Christmas deals with divisibility of numbers.   Grade school children are required to know by heart the divisibility rules for numbers such as 2, 3, 4, 5, 7,  8, 9, 10 and 11.  Also a…

## MSC #14 – Digit Sums: Casting Out 9s

All grade-school learners are taught that “a number is divisible by 9 if the sum of its digits is divisible by 9”. However, only a few are taught that there is no need to divide. If the digit sum has…

## MSC #13 – Short Division

Almost sixty years ago, I learned the “long” division method from my teachers at the San Roque (now Manuel Roxas) Elementary School in Cavite City. I often wondered why this is called as such when we were not taught the…

## 30 Master Strategies in Computing E-book, Vol 1

This e-book is the abridged version of the first of three volumes of the soon to be printed “30 Master Strategies in Computing” which was specially written to celebrate  the 30th anniversary of our school, MSC Institute of Technology. It…

## DEVELOPING DIVISIBILITY RULES FOR ANY DIVISOR

Yesterday, I read a post here in Facebook about a 12-year old Nigerian boy, Chika Ofili, who received a special recognition for discovering a new formula for divisibility by 7, while doing his holiday assignment. The book they are using…

## MSC #11 – Base Multiplication

Vedic Mathematics use base multiplication extensively. Also called “Nikhilam” multiplication because it uses “All from 9 and the Last from 10”(see MSC #2) in determining the 10’s complements of the factors. Although other bases may be used, multiplications near powers…

## Math is Fast – MSC #1: By One More Than the One Before

What is the value of 23.512 to the nearest whole number. Ans: The decimal part, 0.512 is more than half of 1, so the nearest whole number is one more than 23, the number before it, or 24. 2. What…