The maximum single-digit sum is 9 + 9 = 18. Adding the maximum incoming carry of 1 gives 19. Because 19 produces a tens digit of 1, the carry can never exceed 1.
Class 9 Ganita Manjari Part 2 chapter 11 question answer
Class 9 Ganita Manjari Part 2 chapter 11 The World of Algorithms solutions
The value of carry cannot exceed 1 because each column contains at most two single digits from 0 to 9. The greatest possible sum of two digits is 9 + 9 = 18. Even when adding the maximum possible previous carry of 1, the sum reaches only 18 + 1 = 19. Since 19 has a tens digit of 1, the resulting carry cannot exceed 1.
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