Earth Day Worksheets - Super Teacher Worksheets 1st through 3rd Grades View PDF Subtraction - Earth Day FREE This 3-digit subtraction worksheet has Earth Day graphics and a word problem about planting trees. 2nd through 4th Grades View PDF Subtraction Puzzle: Earth Day Subtract the four-digit minus three digit subtraction problems. The complete the puzzle based on the answers. 3rd and 4th Grades