You will need to calculate using a column method, which is another name for long multiplication. This will allow you to multiply up to 4-digit numbers by 2-digit numbers.

Partition method of multiplication by a 2-digit number Use the partition method to multiply a 3-digit number by a 2-digit number. Partition ... the smaller number using the place values of each digit.

Learn how to multiply 2-digit numbers mentally with this step-by-step guide for kids. Discover simple techniques to boost calculation speed, improve mental math skills, and build confidence for ...

To multiply two numbers by hand take a few steps but it’s something we’re taught in school. When dealing with big numbers, really big numbers, we need to a quicker way to do things.

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.

The new technique is for really large numbers, and if it passes a peer-review, could be the fastest possible way of multiplying whole numbers.