Whew! This latest whimsical work from Scieszka and Smith (The True Story of the Three Little Pigs; The Stinky Cheese Man) is bound to stretch out the old thinking cap. The day after her teacher announces, "You know, you can think of almost everything as a math problem," the narrator is afflicted with a "math curse" that affects how she views every facet of her day ("Everything seems to be a problem"). A minimum of the questions she asks herself are entirely logical ("How many quarts are in a gallon?"); some are far-fetched extrapolations (if an M&M is about one centimeter long and the Mississippi River is about 4000 kilometers long, how many M&Ms would it take to measure the length of this river?); and a happily hefty number are sheer nonsense: "I undo 8 buttons plus 2 shoelaces. I subtract 2 shoes. I multiply times 2 socks and divide by 3 pillows to get 5 sheep, remainder 1, which is all I need to count before I fall asleep." Like the text, Smith's wonderfully wacky collage-like art will give readers ample food for thought-even if it's part junk food. Here's a morsel: "Does tunafish + tunafish = fournafish?" Kids will want seconds-count on it. Ages 7-up.