Learn how to partition two digit numbers to make multiplying them easier with Bitesize First and Second Level Maths.

Snoot and Fin partition two digit numbers to make multiplying them easier.

We'll explore how this shortcut works for both two-digit numbers multiplied by themselves, and even for multiplying two different numbers ending in 5.

In long multiplication, we have to multiply every digit of the first number by every digit of the second number. If the two numbers each have N digits, that’s N2 (or N x N) multiplications altogether.

Schönhage and Strassen predicted that an algorithm multiplying n -digit numbers using n * log (n) basic operations should exist, Harvey says. His paper is the first known proof that it does.

Learn how to multiply any number by 11 instantly with this simple math trick. Perfect for school students to solve problems faster and impress friends in class.

Multiplying two 10-digit numbers using traditional methods requires 10 × 10 = 10 2 = 100 small multiplications, but only around 10 1.58 ≈ 38 using Karatsuba’s method.