The first calculating device is the? by Sunday | Jan 20 | Computer Studies WAEC | 0 comments A. Abacus B. Census machine C. Difference engine D. Napier bones. Correct Answer: Option A – Abacus Users Also Read These:An electrical device has 50 turns in its primary…Pascal's calculating machine was useful in?In calculating the national income of a country X,…In calculating the Gross National Product (GNP) by…A literary device used in the first line is?