Use a little bit of logic to find out the rule that links "input" and "output" in these math puzzles.

Find the mathematical rule in these math tables. Compare the input and output numbers to find the hidden pattern in each table.

Compare your "input" number to the corresponding "output" number to find the pattern in each table and fill in the missing numbers.

This colorful worksheet will give your second grader the boost she needs to become a subtraction know-it-all!