During each stage of the pipeline, we can apply one or more arithmetic operators to perform intermediate calculations.

• $abs, the absolute value.
• $add, can add numbers or a number to a date to get a new date.
• $ceil / $floor, ceiling and floor functions.
• $divide, to divide between two inputs.
• $exp, raises the natural number e to the specified exponential power.
• $pow, raises a number to the specified exponential power.
• $ln / $log / $log10. To calculate the natural log, the log on a custom base or a log base 10 respectively.
• $mod, the modular value.
• $multiply, to multiply between inputs.
• $sqrt, the square root of the input.
• $subtract, the result of subtracting the second value from the first. If both arguments are dates, returns the difference between them. If one argument is a date (has to be the first argument) and the other is a number, returns the resulting date.
• $trunc, to truncate the result.