Ten exuberant chicks head to the park for playtime and a self-guided math lesson.The chicks, who sport feathers in various shades of yellow, brown, and black, have brought a notepad and are "ready to add!" They observe and calculate different chick configurations within each game or on a piece of playground equipment. Throughout, "a lonely mouse watches," mimicking their play from afar. Ten stacked chicks are ultimately not tall enough to reach a basketball lodged in the hoop; but 10 chicks "plus 1 helpful mouse" are! The sums do not appear in order (4, 5 ,6, etc.), and this lack of pattern discourages guessing. They do appear on the same spreads as the setup: On the left, "2 chicks far plus / 2 chicks near equals…" appears within eyesight of "4 chicks playing tag" on the right. This design aspect suits the book to younger readers who are still being introduced to basic arithmetic functions and are not quite ready for independent work. On each calculation page, a chick uses the notepad to visualize one of many addition methods. Backmatter gives further explanations on these tools, describing a standard equation, tally marks, number lines, a number bond, and fingers "(or feathers)," among others. Hand-done textures on the digital illustrations appear delightfully scratched, as if by chicken feet, and playful, emphasizing the lighthearted tone of the lesson.Practical application mixes with play, adding up to enjoyable learning. (Picture book. 4-7)