Multiplied by 3, only the mantissa of 7 is 1, so it is equal to 7.

3*7=2 1, and then dozens of digits are 7,7-2 = 5.

So Le =5, the hundredth is 5.

3*5= 15,5- 1=4

So all =8, and then thousand is 8,

3*8=24,8-2=6

So learn =2, and then ten thousand digits are two.

3*2=6,2-0=2

So the number =4

The math club is 42857.