ready reckoner
柯林斯詞典
1. N a table of numbers used to facilitate simple calculations, esp one for applying rates of discount, interest, charging, etc, to different sums 簡(jiǎn)便計(jì)算表
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1. N a table of numbers used to facilitate simple calculations, esp one for applying rates of discount, interest, charging, etc, to different sums 簡(jiǎn)便計(jì)算表