Numbers and counting worksheets for Grade 1 | Math Skills ... What you need to know about our Numbers and counting worksheets for Grade 1. Place value as one of many grade 1 number math activities will help our first graders to understand and use numbers up to 100 with much confidence. Moreover, with this understanding, kids will equally be free from the stress of mixing numbers such as 32 and 23, 62 and 26, etc.