which digit makes 345 blank divisible by 2

None of those. Numbers ending in 5 are never divisible by 2.

blank must be an even digit

To find the digit that makes 345 blank divisible by 2, we need to check if the last digit of 345 is divisible by 2. A number is divisible by 2 if its last digit is either 0, 2, 4, 6, or 8.

In this case, the last digit of 345 is 5. Since 5 is not divisible by 2, we need to replace the blank with a digit that is divisible by 2.

The digit that needs to be in the blank to make 345 divisible by 2 is either 0, 2, 4, 6, or 8.