The document is an interactive math book about penguins that prompts the reader to: 1) Count 20 penguins shown and type the number. 2) Group some penguins and write an addition number sentence, such as 7 + 3 = 10 penguins. 3) Regroup the penguins and write another addition number sentence, such as 5 + 5 = 10 penguins. 4) Order 10 penguins from largest to smallest number and fill them in by color.