Students had to complete a difficult mental math task in front of the same upper-year students.
学生们必须在同一批高年级学生面前完成一项艰巨的心算任务。
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The heart-stopping moment was quickly followed by mental math.
在这个惊心动魄的时刻之后，我很快就开始在内心计算。
One has to do the mental math: nominal return minus inflation is real return.
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There is no fumbling with wallets in the dark, no waiting for change and no need for lightning-quick mental math skills for calculating gratuity.
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The vast majority of the research did not directly compare gaming with hours of other intense, mental activities such as solving math equations.
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