$ADA What is 100" can depend on the context, but here are some possible explanations:

If it's a question:

What is 100? – It could refer to a number, percentage, monetary value, etc.

If it's a shortlist:

"CAD 100" might be intended, meaning 100 Canadian dollars (CAD = Canadian Dollar).

In a mathematical context:

It could be part of a question or problem: "What is 100 x 2?" etc.