The thinking in each chapter uses at most only elementary arithmetic, and sometimes not even that.

每一章的思考最多只使用了初级算术，有时甚至不需要用。

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Second, the paper defines evaluation index entropy and entropy weight, and elementary arithmetic of multi-objective synthetic evaluation based on entropy weight is described.

定义了评价指标的熵和熵权的概念，并提出了基于熵权的多指标综合评估的基本算法。

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Elementary schools at that time focused on basic education - reading, writing, arithmetic.

那时候，小学主要注重基础教育，读读、写和算术。

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Your plan with one of the other carriers will certainly differ, but some elementary arithmetic indicates that the T-Mobile plan could actually save callers between 10 and 15%.

FORBES: Don't Discount T-Mobile's Plan to Charge Full Price for iPhones