Flipkart and the Man Whose Name Was on Every Problem: The Story of The Math is Mathing

Every Indian student who grew up in the 1980s, 1990s, or 2000s — and a significant portion of those who came after — knows the weight of a particular book. It is not a light book. It is not a brief one. It is a thick, cheerful-yellow-spined volume whose presence in a school bag meant that this was a maths day, which meant that the day ahead required a particular kind of fortitude.

The book was called Mathematics. The name printed on the cover — in the same place where every other textbook carried an author's name that nobody ever remembered — was different. This name was remembered. This name was repeated in hallways and whispered over exam tables and mentioned in the particular tones that students use for things that are both essential and slightly terrifying.

R.D. Sharma.

Dr. R.D. Sharma had spent most of his adult life in classrooms. He had taught mathematics. He had written the textbook that accompanied tens of millions of Indian students through their secondary and senior secondary years — the textbook that lived under desks and inside bags and on the floors of examination halls, that was consulted the night before tests and abandoned the moment the test was over, that was associated, in the collective memory of a nation of former students, with everything that maths felt like at its most demanding: the unsolved problem, the formula half-remembered, the neat solution that arrived two minutes after the paper was handed in.

In September 2025, Dr. R.D. Sharma stepped onto a film set for the first time in his life. He was there for Flipkart.

The Campaign Nobody Saw Coming

When Flipkart announced the cast for its 2025 Big Billion Days campaign, the Indian internet collectively did something it rarely does: it stopped scrolling.

Not because the campaign featured the biggest Bollywood star of the season. Not because it promised the most dramatic production values or the most elaborate narrative. But because the face looking back at audiences from the campaign's promotional materials was one that they had not expected to see anywhere outside of a classroom or a bookshelf — and certainly not in a Flipkart advertisement.

It was him. The man whose name was on the book. The man whose problems they had struggled over. The man who had occupied, for years, the specific corner of their consciousness reserved for mathematics — which is to say the corner that was simultaneously essential and slightly anxiety-producing. Dr. R.D. Sharma, in his first-ever commercial campaign, was doing something that the students who had grown up with his textbooks had never once imagined: he was appearing in a Flipkart advertisement, and he was helping them shop.

The campaign was titled The Math is Mathing — a contemporary Gen-Z phrase that used maths as its central metaphor — and it was conceptualised by creative agency Talented and directed by Anant Sharma.

The Idea: When Problems Become Offers

The creative concept was elegant in its simplicity and perfectly matched to the specific cultural weight that Dr. R.D. Sharma carried.

The film positioned Dr. Sharma in an unconventional role — not the stern textbook author of school-day memory, but a jovial, humanised figure who was genuinely curious about the way his subject intersected with modern Indian life. In the film, he invited shoppers to submit their most humorous, quirky, or unusual mathematics problems — the kind that reflected today's real-world scenarios rather than the abstract word problems of school textbooks. These problems were then reimagined as special offers available during the Big Billion Days sale.

The campaign also highlighted a sharp and funny observation that anchored its central theme: technology, fashion, and lifestyles keep evolving, while math questions remain unchanged. The train-leaves-the-station problem. The pipes-filling-a-tank problem. The ages of two brothers. These problems had been in Indian school textbooks for generations — the same scenarios, the same variables, the same solutions — while everything around them had transformed beyond recognition. The irony was precise and the nostalgia was immediate.

The campaign's interactive dimension — inviting shoppers to create their own maths problems that reflected contemporary scenarios, which Dr. Sharma would then convert into offers — turned a promotional campaign into a participatory moment. It was not just an advertisement. It was an invitation.

The Man in the Middle of His First Film Set

Dr. R.D. Sharma, who had spent most of his life inside classrooms, described the experience of stepping onto a film set with the genuine wonder of someone encountering an entirely new world:

"I have spent most of my life inside classrooms, so stepping onto a film set was a completely new experience for me. The team made me feel comfortable from the very beginning. It was heartening to see how mathematics, which has been my passion, could be reimagined in such a fun way. Working on this film with Flipkart and Talented has been memorable and joyful."

There was something quietly moving about this — the humility of a man whose textbook had occupied the consciousness of multiple generations of Indian students, who described being made to feel comfortable on a film set as though it were the most natural thing to note, who used the word joyful about a process that the students who grew up with his book might have associated with precisely the opposite feeling.

Pratik Shetty, Vice President of Growth and Marketing at Flipkart, articulated what made the casting decision so particular: "Very few people cut across generations the way Dr. R.D. Sharma does. Parents, children, even grandparents know his name and his books. To bring someone so universally familiar into Flipkart Big Billion Days was a once-in-a-lifetime opportunity for us. Campaigns like this remind us that disruptive ideas are not just creative flourishes — they drive real impact and translate into stronger engagement with the sale."

The reaction confirmed the reading. Audiences found the campaign hilarious, nostalgic, and one of the best campaigns of the year. Comments poured in: "This is for the first time I have seen R.D. Sharma." "What a brilliant advertisement." "Great ad. Kudos to the marketing team." The campaign became a viral talking point — shared not by people who were primarily responding to a sale promotion but by people who were responding to a feeling. The feeling of seeing something they hadn't expected to see, in the best possible way.

The Creative Team's Full-Circle Moment

For the team at Talented — Vaibhav Pachisia and Abhishek Kumar, who led the creative and brand strategy — the campaign carried a personal weight that went beyond its professional ambitions:

"We left math the moment we were allowed to drop it as a subject, but till the time it was in our lives, it was always with Dr. R.D. Sharma's books. Which is why meeting him in person for this campaign was surreal. The man whose name was stamped on every problem we solved (and many we left unsolved) was sitting across from us, humble, and genuinely curious. This campaign was a full-circle moment — from dreading math to celebrating it in a campaign with Mr. Math himself."

Bushra Shariff, the producer, added a dimension that only a professional who is also a former student could provide: "Producing with Talented is always fun. Even on a tight timeline, we managed to whip up a jingle like a perfect piece of π. With Anant Sharma directing — truly one of the best collaborators out there — and Dr. R.D. Sharma himself as the star, it felt unreal. The 10th-standard version of me was fangirling the entire time."

This self-awareness — the creative team acknowledging their own identity as former students of the man they had cast — was part of what made the campaign feel genuine rather than calculated. The nostalgia was not manufactured. It was lived. Every person involved in the making of the campaign had grown up with the textbook. Every person involved had their own version of the unresolved problem, the half-remembered formula, the specific anxiety of a maths examination.

Five Lessons We Should Learn From This Campaign

1. The Most Powerful Celebrity Is the One Who Lives in Memory, Not on a Screen

India has no shortage of film stars, sports icons, and social media personalities available for brand endorsement. Flipkart's decision to cast Dr. R.D. Sharma — a man who had never appeared in a commercial, whose public profile was entirely academic, whose fame was built entirely through a textbook rather than through entertainment — was a declaration that the most culturally resonant celebrity is not necessarily the most visible one.

Dr. Sharma lived in the memory of hundreds of millions of Indians as a formative presence — someone associated with the experience of learning, of struggling, of eventually (or not) solving the problem. That presence in memory was more deeply personal than any film star's screen image, because it was not watched from a distance. It was lived through.

The lesson: the most effective brand ambassadors for a sale event that needs to generate genuine excitement are not the ones with the largest social media following. They are the ones who occupy the most personal and emotionally specific space in the audience's own history. The celebrity who lived in the classroom of your childhood is more intimate than any film star. And intimacy, in advertising, is the foundation of engagement.

2. Nostalgia Is Most Powerful When It Is Specific, Not General

The Math is Mathing campaign did not invoke a general sense of the past. It invoked the specific past of a specific experience that every Indian who went to school in a certain era shared: the particular weight of Dr. R.D. Sharma's textbook. The specific anxiety of the word problem. The specific relief of finishing the chapter. The specific identity of a name that was on the cover of a book that defined a significant portion of your academic childhood.

This specificity was the campaign's most important quality. Generic nostalgia — the sepia-toned warmth of a past that is more atmospheric than specific — produces a vague warmth and nothing more. Specific nostalgia — the kind that names the book, shows the man, invites you to submit the kind of problem that still lives in your muscle memory — produces recognition. And recognition, in advertising, is the emotional response closest to action.

The lesson: when a brand wants to use nostalgia as a creative tool, the investment should be in specificity. The more precisely a campaign names the thing that the audience shares — the exact book, the exact person, the exact problem — the more deeply it will land. Vague nostalgia is a category. Specific nostalgia is a memory. Only memories move people to act.

3. The Interactive Campaign Element Is the Difference Between Advertising and a Moment

The invitation for shoppers to submit their own quirky maths problems — which Dr. Sharma would then convert into sale offers — was not a supplementary feature of the campaign. It was the transformation that turned a broadcast advertisement into a participatory cultural moment. It gave every person who encountered the campaign something to do: not just to watch, but to engage. To contribute. To become, in a small way, part of the story.

This participatory dimension changed the audience's relationship to the campaign from viewers to players — and players are more engaged, more invested, and more likely to share than viewers. The lesson: campaigns that create a mechanism for audience participation — that give people something to do beyond watching — generate a depth of engagement that one-directional advertising cannot replicate. The best participatory mechanisms are those that emerge naturally from the campaign's central concept. The invitation to submit maths problems worked because it was inseparable from Dr. Sharma's identity and the campaign's core idea.

4. Cultural Capital Is More Durable Than Celebrity Capital

Dr. R.D. Sharma's name recognition among Indian adults is, by any measure, extraordinary. But it is not the kind of name recognition that fades when a film underperforms or a social media post misses the mark. It is the kind of name recognition that is built into the structure of education itself — stamped on the front cover of a textbook that millions of children carried to school, year after year, for decades.

This is cultural capital in its most durable form: not earned through entertainment or personality, but embedded in the infrastructure of how a country educates its children. A generation that grew up with Dr. Sharma's book will not forget his name. And the generation after them, whose parents speak of the book with a mixture of nostalgia and mild horror, will know the name from the stories.

The lesson: when a brand is looking for a face that will cut across not just demographics but generations — that will be recognised by parents, children, and grandparents simultaneously — cultural capital often outperforms entertainment celebrity. The figure who is embedded in the structure of education or culture reaches people in a way that no amount of media presence can replicate.

5. A Disruptive Casting Choice Is Its Own Media Strategy

The campaign was announced before the sale began. And the announcement itself was news — not because Flipkart had announced its Big Billion Days campaign, which was expected, but because of who was in it. The choice of Dr. R.D. Sharma as the face of a shopping sale campaign was so unexpected that it generated coverage, social media discussion, and sharing before a single rupee of media spend had been deployed on the campaign itself.

This is the highest form of casting intelligence: choosing a face that makes the fact of the advertisement into a story that people want to tell each other. Not have you seen the new Flipkart ad but have you seen who is in the new Flipkart ad — a completely different conversational driver, one that treats the casting choice as inherently shareable information.

The lesson: casting decisions for high-stakes seasonal campaigns should be evaluated not just for their on-screen effectiveness but for their ability to generate earned media before the campaign has even aired. The question to ask is not will audiences respond well to this person but will the announcement of this person's involvement be a story in its own right.

The Problem Nobody Left Unsolved

There is one problem in the R.D. Sharma textbook that every former student remembers, even now. Not because they solved it. Often because they didn't. The specific problem varies — the trains, the pipes, the brothers whose ages were always a year apart — but the feeling is consistent. The feeling of looking at a page and knowing that the answer exists, that the method exists, that someone has worked this out before you, and that you are simply the latest in a long line of students arriving at this problem for the first time.

Dr. R.D. Sharma is the person who set all of those problems. He sat across from the creative team at Talented, humble and genuinely curious, and listened to them explain how mathematics could be used to turn a shopping sale into a cultural moment. He stepped onto a film set for the first time in his life and made it look entirely natural. He looked at the camera and invited India to send him their quirkiest maths problems.

And India — which had been waiting, without knowing it was waiting, for exactly this kind of full-circle moment — did the math. And the math was, in the end, quite simple.

The Math is Mathing.