Multiply the lottery number by 3. 14 to take the first three digits (thousands and hundreds), and then add the third digit to the first two digits to subtract the difference between the sum and the single digit of the lottery number, which is equal to the next sum or sum tail.

For example:

Subtract the lottery number and value from the total, multiply the first two digits of 3. 14, and add the third digit and the single digit.

Earned figures

1958 301126026-11=1515+0 =15 (right)

1966541520520-15 = 55+5+4 =14 (right)

1977341423023-14 = 99+0+4 =13 (right)

198328131021kloc-0/3 =-3-3+2+8 = 7 (right)

199214706706-7 =-1-1+7+4 =10 (error)

2006671920920-19 =1+9+7 =17 (error)

201380119111= 00+9+0 = 9 (right)

2026 129

Speaking of the third group, it seems not accurate. This method has not been very effective recently, but it can still narrow the scope of summation.