1.(school subject)算术
The school doesn't seem to teach arithmetic.这所学校好像不教算术。
2.(calculations)演算；计算
If my arithmetic is right, that makes 72.如果我算得对, 结果就是72。
He got his arithmetic wrong.他算错了。
3.(skill in calculation)算术技能；算术知识
My arithmetic's not very good.我算术不怎么好。
4.the arithmetic
(of particular situation;numerical aspects)数字；数目
the arithmetic of the 2009 budget2009年的预算数字