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Two-digit arithmetic operations
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根据（https://makerworld.com/en/models/1294779-dual-color-number-wheels-for-life-counters）的模型修改。因为小孩喜欢数学或数字，本模型可以支持两个两位数的四则运算。但如果用算除法的，要将就从右至左进行计算，运算轮已有“=”号或“≈”号的选择。 另外要注意的是，左右侧盖是要区分左右的，打印时请成对打印。安装时中轴也要观察一下轮纹再安装。
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