Matching by addition involves finding pairs of numbers that add up to a given sum. Here's how you can approach it: Identify the target sum you want to match. Start with one number and find its complement, the number that, when added to it, equals the target sum. Look for other numbers that, when added to the first number, equal the target sum. Continue pairing numbers until all possible combinations are found. Double-check each pair by adding the numbers together to ensure they equal the target