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:Pascal's calculating machine was useful in?An electrical device has 50 turns in its primary…In calculating mean one should?SS1 Second Term Further Mathematics Lesson Note –…In calculating the total cost of a menu; it is…