1. The problem is to add the pairs of numbers given vertically. 2. Addition is the process of combining two numbers to get their total or sum. 3. We add each pair step-by-step: - $13 + 6 = 19$ - $4 + 13 = 17$ - $16 + 17 = 33$ - $14 + 11 = 25$ - $15 + 13 = 28$ - $18 + 10 = 28$ - $15 + 2 = 17$ - $13 + 8 = 21$ - $1 + 5 = 6$ - $6 + 10 = 16$ - $17 + 7 = 24$ - $6 + 1 = 7$ - $1 + 8 = 9$ - $4 + 14 = 18$ - $16 + 6 = 22$ - $2 + 15 = 17$ - $16 + 5 = 21$ - $7 + 12 = 19$ - $14 + 4 = 18$ - $14 + 9 = 23$ - $12 + 1 = 13$ - $0 + 7 = 7$ - $9 + 1 = 10$ - $0 + 8 = 8$ - $16 + 10 = 26$ - $17 + 14 = 31$ - $9 + 18 = 27$ - $17 + 1 = 18$ - $1 + 9 = 10$ - $16 + 9 = 25$ - $12 + 4 = 16$ - $3 + 16 = 19$ - $13 + 11 = 24$ - $7 + 7 = 14$ 4. Each sum is found by adding the two numbers directly. 5. This completes the addition for all pairs given.