犀牛媽媽Riley正在和小犀牛Ryker玩捉迷藏。

她聽到森林裡的聲音。會不會是Ryker？Riley衝向聲音來源，但她沒有看到樹，於是一頭撞上了大樹！

跟隨犀牛們在熱帶雨林中嬉戲冒險，學習如何從一數到十，並學習有關蘇門答臘犀牛的有趣小知識！

《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。

Riley the Rhinoceros is playing hide and seek with her calf, Ryker. She hears noises in the forest. Could that be Ryker? Riley charges toward the sounds.

She does not see the trees and crashes into them!

Follow the rhinoceros' playful adventure in the rainforest, and learn about ordinal numbers and counting to ten.

Read fun facts about the Sumatran rhinoceros!

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!