1. Mental arithmetic and fast thinking are necessary skills for competitive play.2. You have to be pretty good at mental arithmetic to play this game. 3. She counts her understanding of economics and mental arithmetic among her strong points. 4. Charles cocked his shaved head and did some mental arithmetic . 5. Truss has also criticised the over-reliance on calculators to the detriment of mental arithmetic . 6. He was exceptionally hardworking, and had an excellent memory and ability to perform mental arithmetic . 7. Mental arithmetic is difficult because the brain doesn't have the correct software for doing computations.8. While the human brain could never hope to juggle the mental arithmetic involved, computers can. 9. The formula can, under some circumstances, reduce the calculation to one of mental arithmetic alone. 10. :Good mental arithmetic stategies work by breaking the problem down in many easy to compute substeps.
