Given multiplication is $\begin{array}{cccccc} & & & P & E & N \\ & & & I & N & K \\\hline & & L & K & P & R \\ & I & R & T & N & \\ E & A & K & N & & \\\hline L & E & T & T & E & R \end{array}$
how to find the values of the letters?
Given multiplication is $\begin{array}{cccccc} & & & P & E & N \\ & & & I & N & K \\\hline & & L & K & P & R \\ & I & R & T & N & \\ E & A & K & N & & \\\hline L & E & T & T & E & R \end{array}$
how to find the values of the letters?
Start from N*N ends in N, so N must be 5 or 6 (can't be 0 or 1 from the second line in the sum). Then I*N ends in N (and I !=1) says N is 5 and I is odd. Then K is even and R is 0. Continue
Rules:
1) If $ A+B=A$ then $B= 0$ or $9$.
2 4 6 0
3 0 7 5
2 1 7 7 1 0