Marjorie Rice

Marjorie Rice loved patterns.

She studied five-sided shapes. She wanted to see how they fit together. She looked for ways to cover a flat space. She made sure there were no gaps.

Marjorie worked at her kitchen table. She drew many new patterns there. She even used her own marks to show her ideas.

Experts looked at her work. They found her new patterns were real. One expert even gave her a big cheer.

Her shapes are used in floors today. She showed that anyone can find math.

Marjorie Rice was an amateur mathematician. An amateur is someone who does something for fun. She lived in San Diego. She was a mother of five children.

Marjorie loved to study shapes. She looked at pentagons. These are shapes with five sides. She wanted to know how they fit together. She tried to cover a flat surface with them. She wanted no gaps and no overlaps. This is called tiling.

She did her work at her kitchen table. She often worked when no one was around. She even made her own special marks. These marks helped her show how sides and angles fit.

An expert named Doris Schattschneider checked her work. At first, the marks looked like strange symbols. But the expert found they were correct. Marjorie found many new ways to tile with pentagons. She found 103 different ways in one group.

One expert gave her a standing ovation. This is when people stand up to clap. People even used her patterns for a floor in Washington, D.C. Marjorie showed that anyone can find new math.

Have you ever tried to cover a floor with tiles? If the tiles fit perfectly, there are no gaps or overlaps. This is called tiling a plane. Most shapes, like squares, do this very easily. But some shapes are much harder to use for tiling. Marjorie Rice was interested in a special shape called a pentagon. A pentagon is a shape with five sides. Scientists wanted to know every way a five-sided shape could tile a flat surface.

Marjorie was an amateur mathematician. This means she studied math because she loved it. She lived in San Diego and was a mother of five children. She read a monthly column called "Mathematical Games" in a magazine. This column talked about how shapes fit together. In 1975, she read about how experts thought they had found all the pentagon tilings. But then, a reader found a new one. This news inspired Marjorie to try finding her own.

Marjorie did her math work at her kitchen table. She often worked when her family was not around. She even hid her drawings when people came to visit. She created her own special way to write down her ideas. This system used marks to show how sides and angles worked together. It was a unique way to explain her math. She used these ideas to find many new patterns.

She found many new ways to tile with pentagons. By October 1976, she found 58 different ways. Most of these were ways that no one knew before. By December 1977, she had found 103 different ways in one specific group. An expert named Doris Schattschneider checked Marjorie's work. At first, the marks looked like strange symbols or hieroglyphics. But Doris soon saw that the math was correct.

Marjorie's work was a fantastic achievement. In 1995, an expert gave her a standing ovation. This is when a whole room of people stands up to clap. People even used her patterns for a floor in Washington, D.C. Her life showed that anyone can discover something new. She was born in Florida in 1923 and died in 2017. Her papers are now kept safely in a library in Canada.

Tiling a plane means covering a flat surface with shapes. These shapes must fit together perfectly without any gaps or overlaps. This process is also called tessellation. While shapes like squares tile easily, certain other shapes are much harder to use. Marjorie Ruth Rice was an American amateur mathematician who focused on a difficult problem. She studied how convex pentagons, or five-sided shapes, can tile a plane.

Rice was a mother of five living in San Diego, California. She did not have a professional degree in mathematics. Instead, she had a high-school education and some training in commercial art. She became fascinated by math through a magazine column. The column was called "Mathematical Games" by Martin Gardner in Scientific American. Rice would often rush to get the magazine from the mail. She read a 1975 article about how convex polygons tile a plane. That article suggested the list of pentagon tilers was already complete.

However, the completeness of the list was soon challenged. A reader named Richard James III found a new pentagon tiler. Gardner published this discovery in December 1975. This news inspired Rice to start her own investigations. She worked on these problems during her free time. She often drew diagrams on her kitchen table. She would hide her work when her husband or children returned. She even developed her own unique system of notation. This system used special marks to show the relationships between sides and angles.

Rice's discoveries happened in rapid stages. In February 1976, she found a new pentagon type and its variations. She sent these results to Gardner using her homemade notation. Gardner sent her work to Doris Schattschneider, a tiling expert. Schattschneider was initially skeptical of the strange symbols. She described the notation as looking like "hieroglyphics." After careful study, Schattschneider validated that Rice's results were correct.

By October 1976, Rice had found 58 different pentagon tilings. Most of these were previously unknown to mathematicians. She organized these into 12 distinct classes. These tilings were "2-block transitive," meaning two pentagons must be joined to tile the plane. By December 1976, she found two more new types. These created over 75 distinct tessellations in blocks that looked like double hexagons. By December 1977, she discovered her fourth new type of tile. By that time, she had identified 103 of these 2-block transitive tilings.

Rice's achievements earned her significant respect in the math community. In 1995, Doris Schattschneider gave a lecture about Rice's work in Los Angeles. At the end of the talk, the audience gave Rice a standing ovation. Her patterns even became part of a physical building. In 1999, one of her tilings was used for the floor in the Mathematical Association of America headquarters. This building is located in Washington, D.C. Her work proved that amateur researchers can make major scientific contributions.

Marjorie Rice was born in St. Petersburg, Florida, in 1923. She died in San Diego in 2017. Her mathematical papers are preserved today in Canada. They are held at the University of Calgary Library in the Eugène Strens Recreational Mathematics Collection. Her life is also celebrated in literature. A children's book titled "The Five Sides of Marjorie Rice" was published in 2025. Her story connects the world of art and the world of geometry. It shows how curiosity can lead to new mathematical truths.