All numbers which are divisible by 4 may not be divisible by 8.
Idea: A number is divisible by 4 if it can be written as \(4 \times k\) (no remainder).
But to be divisible by 8, it must be \(8 \times m\) (no remainder).
Counterexample: Take \(12\).
Check with 4: \(12 \div 4 = 3\) (remainder \(0\)). So 12 is divisible by 4.
Check with 8: \(12 \div 8 = 1\) (remainder \(4\)). So 12 is not divisible by 8.
Conclusion: There are numbers (like \(12\)) that are divisible by 4 but not by 8. Therefore, the statement is true.