据说是一位欧洲数学老师给 homeschool 编的教材。同年级难度高于新加坡数学的 Primary Math Workbook,低于新加坡数学的 Primary Math Intensive Practice 和 Challenging Word Problem。他们有好几种系列教材,这里有蓝色, 金色和绿色三种。具体的内容看图片。
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