There are actually two Independence-Day-themed worksheets in this resource. Patriots solve three-digit addition and subtraction problems, then find the letter from the key that corresponds to each of their answers. As they place each letter underneath each answer, the answer to a history question is revealed. Since most schools are not in session during July, you could assign this math practice in conjunction with a US history unit. Note that although the two worksheets have different math problems, the question to be answered is the same.