Methods similar to this go back thousands of years, at least to the ancient Sumerians and Egyptians. Around 1956, the famous Soviet mathematician Andrey Kolmogorov conjectured that this is the best ...

In this video, I explain how to perform two-digit operations quickly using mental strategies. We'll cover **addition**, ...

Multiply Any Number by 11 in Seconds: Having the appropriate strategies may make math enjoyable and simple! One subject in which students frequently struggle is multiplication, particularly when ...

Multiplying 2 x 2 is easy. But multiplying two numbers with more than a billion digits each — that takes some serious computation. The multiplication technique taught in grade school may be simple, ...