ISEE Mathematics Achievement Question 245: Answer and Explanation
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Question: 245
6. What is the smallest number that can be added to the number 1,024 to produce a result divisible by 9 ?
- A. 1
- B. 2
- C. 3
- D. 4
Correct Answer: B
Explanation:
B Use long division to find the remainder of 1,024 divided by 9. The remainder is 7, so add 2 to the total to make the number be divisible by 9. The correct answer is (B). Alternatively, you can use the divisibility rule for 9-the sum of the digits is divisible by 9. 1 + 0 + 2 + 4 = 7, so if 2 is added to that, the sum is 9, which is divisible by 9. Remember, the question asks for the smallest number that can be added to 1,024.