- arithmetical calculations performed in the mind, without writing figures down or using a calculator.
noun: mental arithmetic
Mental Arithmetic 心算 (可能有更專門的心理學定義) Coding ...明帳不同) obvious economic costs 明顯經濟成本 是 Mental Accounting and Consumer Choice...
I do mental arithmetic 4 sections of abacus calculation 1 level
... us to study talent and skill, the ballet, the bead to do mental arithmetic, the calligraphy and the drawing for me all once to study since childhood...