Solving riddles are so much fun with this Back to School Activity set of Addition & Subtraction Math worksheets. Students will get practice with double digital and triple digital addition & subtraction with and without regrouping. 6 worksheets total with print & digital versions of each. Students will read the riddle at the top of each worksheet and then solve the addition or subtraction problems at the bottom of each worksheet to complete the answer code. They will then use the code