Home  >  Clipart  >  School  >  School Blackboard   ...  12 of 20 Free School Blackboard Clipart Clipart picture of a school ruler used sometimes for measurements in mathematical equations for math students in class Full image dimensions ~ 478 x 222 pixels File size ~ 40 KB Related Keywords ~ class ruler, college, mathematics ruler, measuring ruler, ruler, school, school projects, school ruler, student ruler, work ruler This Public Domain image is available for personal and commercial projects. Home  >  Clipart  >  School  >  School Blackboard   ...  12 of 20 Some of this Month's Most Viewed School Clipart ...