“How to one.” A white boy at a playground is going down a slide. “How to two.” A Black girl joins him on the teeter totter. “How to three.” A third child arrives and the trio plays jump rope. As an afternoon of ever-changing play at the park continues (foursquare, sandbox, puddle jumping after the rain), the expanding cast of children eventually numbers ten, with a glimpse of the child about to be added often provided before a turn of the page includes them in the group. As the light angles toward dusk, adults arrive, and the ten children are led away on a countdown page. The original child is shown walking home. “How to one.” And climbing into a grown-up’s lap to read. “How to two.” This original and satisfying counting book offers a compelling visual storyline that depicts diverse children and family structures in the appealing watercolor illustrations. (Ages 2–5)