X Marks the Spot - Math Matters Author:Lucille Recht Penner, Jerry Smath (Illustrator) Brothers Leo and Jake move into their grandfather's old house, where they find several treasure maps. Each map is a chart that they must follow, block by block, to discover the many treasures of their new hometown. Written with a good sense of the small-scale adventures that appeal to children, the story will leave readers wishing they had s... more »uch an imaginative and understanding grandfather. Smath's detailed, light-dappled illustrations amplify the fun in this duo from the Math Matters series.« less