Each difficult fact is illustrated. Once the students learn the story, they recall the mental image and remember the answer to the fact. The Times Book for Kids covers the zero's through nines and has pictures and stories for all the difficult facts, the 3's, 4's, 6's, 7's, and 8's. Tricks are used to teach the easier facts, the 1's, 2's, 5's, and 9's.