Which of the following numbers is NOT divisible by 7?

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Question: Which of the following numbers is NOT divisible by 7?

Options:

Correct Answer: 40

Solution:

40 is not divisible by 7, while 21, 28, and 35 are all multiples of 7.

Which of the following numbers is NOT divisible by 7?

Which of the following numbers is NOT divisible by 7?

Step 1: Understand what it means for a number to be divisible by 7. A number is divisible by 7 if you can divide it by 7 without leaving a remainder.
Step 2: Check each number one by one to see if it can be divided by 7 evenly.
Step 3: Start with the first number, 21. Divide 21 by 7. The result is 3 with no remainder, so 21 is divisible by 7.
Step 4: Next, check 28. Divide 28 by 7. The result is 4 with no remainder, so 28 is also divisible by 7.
Step 5: Now check 35. Divide 35 by 7. The result is 5 with no remainder, so 35 is divisible by 7 as well.
Step 6: Finally, check 40. Divide 40 by 7. The result is approximately 5.71, which means there is a remainder, so 40 is NOT divisible by 7.
Step 7: Conclude that among the numbers given, 40 is the only one that is not divisible by 7.

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