equality in mathematics.

123 abc adding addition additionexample alphabet apple background black blackboard bletters blue board boardred brand calligraphy can chalk chalkboard clock colors com comma creative creatively darkness decimal digits displayed division document drawing easy first flu focus font green handwriting handwritten illustration impossible isolated lesson lessonschool letters math mathematics monochrome multiplication news notation number numbers operation photograph possible poster problem school season seasonflu sign signs sketch srawing subtraction symbol symbols task text various vritten white writing written yes