gMath is a handy mathematical expression builder for Google Docs, Sheets and Forms. that lets you create complex expressions and graphs with ease. The following videos demonstrate how to use this handy tool.
Google Forms – student assessment
Google Docs – student worksheets
Google Sheets – worksheets and quick quizzes
gMath Help – In case your question about gMath wasn’t answered in these videos, there is additional information at the manufacturer’s site.