Students demonstrate their problem-solving ability as they work on this add and subtract 2-digit numbers and multiples of 10 worksheet. Subtraction is the opposite operation of addition and vice versa. Students use this relationship and their understanding of basic addition and subtraction facts to add and subtract 2-digit numbers and multiples of 10 in this worksheet. As the worksheet uses a horizontal format, it allows for more creativity when it comes to how the student solves the problem. In contrast, in the vertical format, students usually employ the standard method to solve.