《MathStart》系列為美國HarperCollins出版的暢銷數學啟蒙書。作者Stuart J. Murphy認為數學與日常生活息息相關，他為了建立小朋友基礎的數學概念與知識，讓小朋友輕鬆愉快地學習數學，因而精心設計了這套生活化的《MathStart》數學啟蒙繪本，從生活話題與情境故事，讓小朋友有效地吸收數學概念。
全系列分為三個Level，Level 2 開始接觸數字的運用與計算 。
Eddie在學校的活動上，有個猜別人年齡的攤位。他至今還沒有猜錯過，如果猜錯，他就會掉進水桶 。艾迪的策略中有一大部分是比較整數，並理解「大於」和「小於」的概念，而這也是小讀者要學會的一項重要的數學技能。
同系列書藉：
Math Start Level 2 Bigger，Better，Best！
Math Start Level 2 A Fair Bear Share
Math Start Level 2 Give Me Half!
Is your age more than 5?
Is it less than 10?
Eddie's got to guess. And he doesn't want to be wrong!
Eddie has a booth at the school fair, guessing people's ages. He hasn't guessed wrong yet, but if he does, he gets dunked. Can Eddie keep guessing right -- and keep from getting wet?
Comparing whole numbers and understanding what's more and what's less is a big part of Eddie's strategy, and it is an important math skill for young readers to learn.
Books in the same series:
Math Start Level 2 Bigger，Better，Best！
Math Start Level 2 A Fair Bear Share
Math Start Level 2 Give Me Half!
Paperback / For Ages: 4-7 / 34 pages