Frankie stared at the first question on his math quiz, and wrote down the number 23. That didn’t seem right. He attacked it with his eraser, leaving behind a black smudge cloud. Maybe if he skipped ahead, the next problem would be easier to solve.
It wasn’t. This one was even scarier. In fact, if Frankie turned his head sideways, the number 3 kind of looked like fangs. He drew a pair of wings on it. Now it was a vampire bat! He added horns and claws and spiked tails to the other numbers.
Frankie’s quiz was covered with number monsters! Better get rid of them before his teacher,...