S. Rajarajan

My Background

About S. Rajarajan

A unique convergence of heavy engineering systems, custom software development, and math visualization.

Educator & Retired Systems Professional

Hello! I am S. Rajarajan, an educator and developer on a mission to simplify mathematics. I graduated with a Bachelor of Science (B.Sc) degree in Physics (1973-76) from Sacred Heart College, Tirupathur, and went on to complete a Bachelor of Technology (B.Tech) in Instrument Technology (1976-79) from the prestigious Madras Institute of Technology (MIT), Chennai, India.

For nearly four decades (1979-2016), I worked globally as an engineering professional in Fertilizer, Oil & Gas, and Control & Automation Engineering Industries. This career allowed me to design and troubleshoot highly complex real-time safety systems across India, Saudi Arabia, Singapore, Brunei, and Kazakhstan.

Throughout my engineering career, my true passion was teaching Mathematics and Computer Science to high school students. Since retiring in 2016, I have dedicated myself fully to educating, designing software tools, and conducting intensive Class 10 board prep workshops that empower students to secure maximum exam scores through visualization and analytical logic.

MIT Chennai B.Tech Graduate

37 Years International Systems Career

Flutter Developer (20k+ Downloads)

Creator of "Sand Granule" on YouTube

Career Timeline

1973 – 1976

B.Sc. Physics

Sacred Heart College, Tirupathur

1976 – 1979

B.Tech. Instrumentation

Madras Institute of Technology (MIT), Chennai

1979 – 2016

Systems Engineer

Oil, Gas & Chemical Plants globally.

2016 – Present

Math Revisionist

Revision seminars & dynamic software tools.

Seminars & Classrooms in Action

Leading Class 10 board exam preparation revision sessions for school campuses.

Interactive Mathematics Revision Seminar

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Live Board Practice Lecture

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Interactive App

Interactive Divisibility Explorer

Test, calculate, and practice fundamental prime divisibility properties using my standalone web visualizer.

Divisibility Rule Practice Suite

A dedicated sub-project built to dynamically break down composite numbers into prime factorizations and display rule logic.

Launch Practice App

Dynamic Coordinate Labs

GeoGebra Graphing Laboratories

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Symmetric Code Art

FMSLogo Mathematical Art Gallery

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Mobile App Engineering

Cross-Platform Flutter Development

High-performance production apps engineered for Tamil scripture reference and holistic utility computing.

20,000+ Downloads Milestone

Devotional App Vel Maaral

Devotional App Sundara Kandam

Devotional App Aditya Hrudayam

Health & Exercise Infinity Walk

Devotional App Kanda Guru Kavasam

Medical Utility Safe Delivery

Video Education

Sand Granule YouTube Workspace

Core mathematical visualizations, physics experiments, and logical derivations published on my educational channel.

GeoGebra Lab

Graphing Linear Functions in GeoGebra

Understanding coordinate translations, lines, and slope behaviors in Cartesian spaces.

Logo Coding

FMSLogo Visual Coding: Shapes & Alphabets

Drawing Tamil vector letters, English alphabets, and symmetric Rangolis.

Visual Tutorials

GeoGebra Tutorial: Geometry & Algebra

Learn coordinates and equations dynamically the fun, interactive way.

Physics Lab

Air Resistance vs. Gravity

Visualizing terminal velocity and freefall friction using animated Red and Blue balls.

Number Systems

Digital Root Concept and Application

Understanding underlying arithmetic properties and practical module-9 shortcuts.

Geometry Spiral

Class-9 Square Root Spiral

Drawing and proving irrational square roots step-by-step on drawing planes.

Turtle Loops

Repeating English Alphabets in FMSLogo

Symmetric repetition loops utilizing the MSWLogo/FMSLogo drawing terminal.

Sieve Filtrations

Sieve of Eratosthenes

Filtration of composite integers to isolate primes dynamically on grid structures.

Logo Programming

MSWLogo Tutorial with Live Examples

Learn turtle graphics from scratch with live examples in under 15 minutes.

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Teacher Resources

Class 10 Board Prep Revision Seminars

A high-yield, 5-hour interactive workshop to help students achieve logical mathematical mastery.

Module I: Morning (2.5 Hours)

Algebra & Coordinate Geometry

Focuses on establishing structured patterns and bypassing formulaic slips using option-elimination hacks.

✓ Real Numbers & Polynomials properties and coefficient relationships
✓ Linear Systems Scale Factors for rapid graphical checking
✓ CBSE 15-Minute Reading Hacks to optimize section workloads

Module II: Afternoon (2.5 Hours)

Geometry, Trigonometry & Data

Targets high-value theorem proofs, spatial volume calculations, and error-free statistical summaries.

✓ BPT/Thales Theorem Proofs: Full structural diagrams & logical justifications
✓ Combined Solids Areas: Visually identifying CSAs of merged objects
✓ Step-Deviation Statistics: Eliminating calculation slips via empirical lines

Premium Printable Workshop Resources

Get instant download access to standard board prep materials built for revision seminars.

MCQ Exam Hacks Worksheet

20 high-yield questions with side-by-side slow vs. fast solution blueprints.

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Step-Marking Poster

Printable classroom poster outlining the 4 crucial board grading milestones.

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Section D & E Companion

Expert tips for tackling long 5-mark templates and extracting Case Study DNA.

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