In order to calculate how many fours digits there are, you could simply divide the initial decimal number by 4.
为了计算有多少个四位数字，你可以简单地用4去除最初的那个十进制数。
T: Now pick two number between one and ten, including decimal numbers and fractions, then add, subtract, multiply or divide them as you like.
现在从1到10之间挑选两个数，包括小数和分数，然后随意进行加、减、乘、除运算。
To divide by ten, move the decimal point one place to the left.
用十除时，把小数点往左移一位。
To divide by ten, move the decimal point one place to the left.
用十除时，把小数点往左移一位。
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