What figure increases its value by one-half when turned upside down?
The figure 6.
什么数字颠倒后会增加一半？
数字6，颠倒后是9。
What figure increases its value by one-half when turned upsi
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What figure increases its value by one-half when turned upside down?
The figure 6.
什么数字颠倒后会增加一半？
数字6，颠倒后是9。