First Grade Math Worksheets PDF | Free Printable 1st Grade ... First Grade Math Worksheets PDF, Free Printable 1st Grade Math Worksheets for teachers and parents. These Math printable Worksheets for Grade 1 are made of colorful and enjoyable exercises on counting and numbers, place values, addition, subtraction, comparing, estimation, spatial sense, data and graph, measurements, patterns, probability, sorting classifying and ordering, time, two and three ...