Do you know why 6 is afraid of 7? Why? Because 7 ate 9 (8).
Do you know why 10 is scared? Why? Because he is between 9 and 11.
Do you know why 6 is afraid of 7? Why? Because 7 ate 9 (8).
Do you know why 10 is scared? Why? Because he is between 9 and 11.
This is a classic math pun. The first part of the joke plays on the similar-sounding 'ate' and '8', making it sound like 7 literally consumed 9. The second part uses the concept of numerical order, where 10 is between 9 and 11 and thus 'scared'. It's a play on words and number concepts to create a silly situation.
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THAT HIT HARD