Math Olympiad 1

Digits & Digit sum( Week 47 Practice)

1. The digit sum of a given number is the sum of all its digits. For example, the digit sum of 12 is 1 + 2 = 3. Which two-digit number has the greatest digit sum?

2. The digit sum of a given number is the sum of all its digits. For example, the digit sum of 12 is 1 + 2 = 3.

83, 84, 85, 86, 87, and 88

Which of the above two-digit numbers has the smallest digit sum?
What is the smallest digit sum?

3. The digit sum of a given number is the sum of all its digits. For example, the digit sum of 12 is 1 + 2 = 3.

65, 66, 67, 68, 69, 70, 71, and 72

Which of the above two-digit numbers has the smallest digit sum?
What is the smallest digit sum?

4. The digit sum of a given number is the sum of all its digits. For example, the digit sum of 12 is 1 + 2 = 3.

84, 85, 86, 87, 88, and 89

Which of the above two-digit numbers has the largest digit sum?
What is the largest digit sum?

5. The digit sum of a given number is the sum of all its digits. For example, the digit sum of 12 is 1 + 2 = 3.

60, 61, 62, 63, 64, 65, 66, and 67

Which of the above two-digit numbers has the smallest digit sum?
What is the smallest digit sum?

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