Dive into number sense skills with these Kindergarten and First Grade Math worksheets and activities focusing on the number 0. These ocean-themed number sense worksheets and activities will keep your students engaged as they practice essential number sense skills like counting, subitizing dots, tally marks, ten frames, recognizing numerals, number words, and more. Students will enjoy color by codes, mazes, cut and paste activities, connect the dots, puzzles, creating the number with manipu