You know, of course, that 7 and 11 are odd numbers. Without using addition, subtraction, multiplication, or division, show how you can make both of these numbers even.
The number 7 can also be represented by the word seven. If we delete the s in seven, we are left with the word even. Similarly, the number 11 can be written as eleven. Deleting the el in eleven leaves us, again, with the word even.