Identify the number that is not divisible by 3.

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Question: Identify the number that is not divisible by 3.

Options:

Correct Answer: 100

Solution:

A number is divisible by 3 if the sum of its digits is divisible by 3. The sum of the digits of 100 (1 + 0 + 0 = 1) is not divisible by 3.

Identify the number that is not divisible by 3.

Identify the number that is not divisible by 3.

Step 1: Look at the number you want to check. In this case, the number is 100.
Step 2: Break down the number into its digits. For 100, the digits are 1, 0, and 0.
Step 3: Add the digits together. So, 1 + 0 + 0 = 1.
Step 4: Check if the sum (which is 1) is divisible by 3. To do this, see if 1 can be divided by 3 without leaving a remainder.
Step 5: Since 1 divided by 3 does not give a whole number (it gives a fraction), 1 is not divisible by 3.
Step 6: Therefore, the original number 100 is not divisible by 3.

Divisibility Rules – Understanding the rule that a number is divisible by 3 if the sum of its digits is divisible by 3.