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:AGE 114 Theory Questions: Motion and Calculating…An electrical device has 50 turns in its primary…Pascal's calculating machine was useful in?The first calculating machine in data processing was?In calculating mean one should?