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:Which of the following factors is not considered…The first calculating machine in data processing was?SS1 Second Term Further Mathematics Lesson Note –…In calculating mean one should?In calculating the national income of a country X,…