Find it hard to think of something to write about? Here is a great resources (Math Middle Years) that includes comments for areas of strength and areas of growth. Document also includes strategies to use at home or in the classroom to improve Math skills like adding, multiplying, basic facts, etc. As a bonus, this document includes a final summary comments as well for Math.
Report Card comments for all other subject areas are also available in my store! Hope it helps save you time!