There are several synonyms that can be used interchangeably with the phrase "sign times". Some alternatives to consider include "multiply", "calculate", "times", and "factor". These words are commonly used in mathematical contexts and are ideal for expressing the idea of performing simple or complex mathematical operations. Depending on the context in which you are communicating, you may opt for one word over another to convey a more specific meaning. For example, "factor" may be used to emphasize the concept of breaking down a number into smaller components, while "calculate" may be used to communicate the idea of performing a more complex mathematical operation. Ultimately, selecting the right synonym will depend on the specific context and purpose of your communication.