《数学天地》和《数学故事》册数的比是 4∶6，《数学故事》的册数比《数学天地》的册数多( )%。
【分析】
根据《数学天地》和《数学故事》册数的比是 4∶6，可知《数学天地》有 4 份，《数学故事》有 6 份，用 6 减去 4，再除以 4，再乘以 100%，就是《数学故事》的册数比《数学天地》册数多的百分之几，即可解答。
【详解】
（6－4）÷4×100% ＝2÷4×100% ＝0.5×100% ＝50%
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