Addition WorksheetThis worksheet helps first graders practice adding multiples of 10 on an open number line. Students solve five problems by plotting the first addend, adding tens step by step, and writing corresponding equations. Sums are limited to 100, with clear visual guidance for mastering addition strategies. Subtraction WorksheetDesigned for first graders, this worksheet focuses on subtracting multiples of 10 from two-digit numbers using an open number line. Students solve five problems