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The Sass arithmetic operations are:

- addition
`+`

- subtraction
`-`

- multiplication
`*`

- division
`/`

, and - modulo
`%`

.

**Note:** Modulo, or `%`

, is the remainder in a given division, so "9%2" would be "1".

SCSS arithmetic requires that the units are compatible; for example, you can't multiply pixels by ems.

Also, just like in regular math, multiplying two units together results in squared units:`10px * 10px = 100px * px`

.

Since there is no such thing as squared units in CSS, the above would throw an error. You would need to multiply `10px * 10`

in order to obtain `100px`

.

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