猩猩Olive 和 Oscar正在互相賽跑，看看誰能找到果實最多的大樹，最後誰會贏得這場比賽？

跟著猩猩在熱帶雨林裡度過豐收的一天，學習跳著數兩個數字，並認識有關蘇門答臘猩猩的有趣小知識。

《快樂學數學》系列啟動孩子的算術能力大躍進！孩子將會愛上書中的可愛動物與有趣故事，並在當中學習序數、數數(counting)、跳數(skip counting)、加法、減法等數學概念。

本系列每冊書中皆附贈互動素材(官網也提供素材檔案，可自行下載列印裁切)，讓每本書都是孩子動手體驗的學習工具。每則故事中也能讀到有趣的科學小知識，在快樂動手學習中，激發孩子對世界的好奇心與對數學的概念的理解。

Olive and Oscar the Orangutans race each other to find the tree with the most fruits.

Who will win the race?

Follow the orangutans' fruitful day in the rainforest and learn to skip count by two.

Read fun facts about the Sumatran orangutans.

Jump start your child's advancement in numeracy with the Happy Learning Math series. Your child will delight in the fun stories about animals and encounter Math concepts, such as ordinal numbers, counting, skip counting, addition, subtraction and more.

Materials for interactive play and links to printables are also included, turning each book into a hands-on experiential learning tool. Fun Science facts are also weaved into each story to spark your child's curiosity about the world.

This book comes with bonus fun and interactive elements to reinforce your child's learning of Math concepts!