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# Key English Expressions for Operators and Expressions

Operators, which perform mathematical and logical calculations, are fundamental elements you will encounter while explaining or debugging code.

In this lesson, we'll first review basic mathematical expression phrases and then explore the names and usages of key operators frequently used in programming.


## Frequently Used Mathematical Expression Phrases

| English Expression                                          | Interpretation in English             |
|-------------------------------------------------------------|---------------------------------------|
| `Add` 3 `to` an integer variable.                           | Add 3 to an integer variable.         |
| `Subtract` 10 `from` an integer variable.                   | Subtract 10 from an integer variable. |
| x % 100 returns the `last 2 digits` of x.                   | x % 100 yields the last 2 digits of x.|
| x % y returns the `remainder` when x is divided by y.       | x % y gives the remainder of x divided by y.|
| x ** (1/2) computes the `square root` of x.                 | x ** (1/2) calculates the square root of x.|
| x // y returns the `floor` of x divided by y.               | x // y returns the floor of the quotient of x divided by y.|
| Round x `to` the nearest integer.                           | Round x to the nearest integer.       |
| Round x `up to` the next integer.                           | Round x up to the next integer.       |
| Round x `down to` the previous integer.                     | Round x down to the previous integer. |
| Truncate x by `discarding` its fractional part.             | Truncate x by removing its fractional part. |

'from'은 빼는 대상이 되는 변수를 나타내며, 'subtract'는 뺴는 동작을 의미합니다.

English Expression	Interpretation in English
`Add` 3 `to` an integer variable.	Add 3 to an integer variable.
`Subtract` 10 `from` an integer variable.	Subtract 10 from an integer variable.
x % 100 returns the `last 2 digits` of x.	x % 100 yields the last 2 digits of x.
x % y returns the `remainder` when x is divided by y.	x % y gives the remainder of x divided by y.
x ** (1/2) computes the `square root` of x.	x ** (1/2) calculates the square root of x.
x // y returns the `floor` of x divided by y.	x // y returns the floor of the quotient of x divided by y.
Round x `to` the nearest integer.	Round x to the nearest integer.
Round x `up to` the next integer.	Round x up to the next integer.
Round x `down to` the previous integer.	Round x down to the previous integer.
Truncate x by `discarding` its fractional part.	Truncate x by removing its fractional part.

Key English Expressions for Operators and Expressions

Frequently Used Mathematical Expression Phrases

Which of the following correctly describes subtraction?