He's not very good at arithmetic.
他不太擅长算术。
a quick bit of mental arithmetic(= sums you do in your head, without writing anything down)
快速心算
I think there's something wrong with your arithmetic.
我认为你的计算有错。
1.算术,算法;计算
2.算术书
1.the part of mathematics that involves basic calculations such as adding or multiplying numbers
2.the process of doing a calculation
3.the number of people or things that are involved in a situation, and the way in which they affect the situation
1.relating to arithmetic
1.The result of experience shows that this kind of arithmetic is remarkably improved compared with current Maximum Matching arithmetic.
实验结果表明，此算法相对于现有最大匹配分词算法有显著提高。
2.She helped him with his English, corrected his pronunciation, and started him on arithmetic.
她帮助他学英语，纠正他的发音，给他上数学启蒙课。
3.The next development in arithmetic was the invention of mechanical devices and machines to speed up the execution of arithmetic processes.
算术上的第二项进展是加速算术运算的机械装置和机器的发明。
4."the usual arithmetic conversions" are not easy to implement and inconsistent across architectures.
“通常的算术转换”不容易实现，而且把建造结构弄的不一致。
5.He accepted their mistaken estimate of his ability, felt that it was 26 to try, and was very poor at arithmetic, just as they expected.
他接受了对他的能力的错误估计，认为它是26的尝试，并在算术很差，就像他们的预期。
6.Mary got 100 on the first test in arithmetic but it was just a flash in the pan because she later failed several times in arithmetic.
玛丽第一次算术考试得了100分，但只是昙花一现，因为后来几次算术考试都不及格。
7.Using what you have learned so far, you could now build a simple calculator to evaluate arithmetic expressions as shown in Listing 9.
使用迄今为止学到的东西，现在能够构建简单的计算器来计算算术表达式，如清单9所示
8.The arithmetic types that represent integers, characters, and boolean values are collectively referred to as the integral types .
表示整数、字符和布尔值的算术类型合称为整型。
9.Many of the familiar algebraic rules for Real number arithmetic do not always hold for floating-point arithmetic.
对于浮点算法而言，许多惯用的实数算法代数规则有时并不适用。
10.Specifies the maximum number of digits in the result of any decimal arithmetic.
指定任意数字算术的结果中数字的最大数目。