Logarithms is the traditional way of adding large numbers

Prior to the 1970s when calculators were not invented multiplying large numbers were very difficult and almost always incorrect, logarithms were used

How to use the LOG formula in Google Sheets - Sheetgo Blog

Log Calculator (Logarithm)

Adding Large Numbers Worksheets

COMMON LOGARITHMS

Logarithm of Numbers Greater than and Less than One

Long Multiplication Method KS2: How To Teach It Step-By-Step

The Big Bang of Numbers: How to Build the Universe Using Only Math: 9781324007036: Suri, Manil: Books

Logarithm Laws Made Easy: A Complete Guide with Examples –

Uses of the logarithm transformation in regression and forecasting

Euler's Number (e) Explained, and How It Is Used in Finance

Logarithms 8 - Properties of Logs