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 ...

Saylor’s alchemy has now started to give way to arithmetic. Absent a turnaround in the bitcoin price, the “infinite money ...

In the early years of the Republic, arithmetic was generally taught to teenaged boys planning careers in commerce, often by private tutors. With the advent of free common or elementary schools ...

Children who count on their fingers between ages 4 and 6.5 have better addition skills by age 7 than those who don't use ...