The material contains a total of 26 columns (A-Z) with 10 exercises for Arithmetic of rational numbers, including the solutions to these columns. It also includes all 26 columns (A-Z) with an enlarged ...

Consider this sequence of numbers: 5, 7, 9. Can you spot the pattern? Here’s another with the same pattern: 15, 19, 23. One more: 232, 235, 238. “Three equally spaced things,” says Raghu Meka, a ...

Everyone knows that arithmetic is true: 2 + 2 = 4. But surprisingly, we don’t know why it’s true. By stepping outside the box of our usual way of thinking about numbers, my colleagues and I have ...

It’s impossible to learn abacus-style mental arithmetic after you’ve become an adult.”When I am involved in teaching the ...

A new proof demonstrates the power of arithmetic dynamics, an emerging discipline that combines insights from number theory and dynamical systems. Click to tell Google to prioritize Quanta and see ...

AN excellent way to see one’s own country, or one’s own century, is to visit another. While I was making just such a mental pilgrimage to the eighth century, a recent interest in unconventional ...