Brian P. Cleary 
Action of Subtraction [PDF ebook] 

The author and illustrator of the best-selling Words Are CATegorical(R) series brings their trademark sense of humor to the subject of subtraction. Rhyming text filled with funny, countable examples shows what it means to take one number away from another. Readers are also introduced to the terminology they’ll encounter as they learn to subtract.From the author and illustrator duo of the best-selling Words Are CATegorical(R) series, Math Is CATegorical(R) introduces basic math concepts for young readers and reveals that sometimes math is easier to show than explain! Pairing clever rhyming verse with comical cartoon cats, Brian P. Cleary and Brian Gable help children add up just how fun math can be!