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 ...

👉 Learn how to find the partial sum of an arithmetic series. A series is the sum of the terms of a sequence. An arithmetic series is the sum of the terms of an arithmetic sequence. The formula for ...

These little geniuses can crack complex three digit arithmetic sums in seconds. In fact, they can even attempt as many as 70 arithmetic sums in just 5 minutes. Their trick is mental maths with the ...

A long-standing puzzle seems to constrain how addition and multiplication relate to each other. A graduate student has gone further than anyone else in establishing the connection. In 1983 the ...

Nearly 1,000 children take up the UCMAS mental maths challenge Dubai: Nearly 1,000 children from across the UAE took up the challenge to test their mental math skills, calculating 200 arithmetic sums ...