Hi, Suppose that you place the Tshape on the grid in some position. Suppose that the Tnumber is N. The number in the T, directly above the Tnumber is then 9 places back in the grid so it is N  9. The number directly above this number is then N  9 9 = N  18. The two remaining numbers in the Tshape are N  18 + 1 and N  18  1. Thus the Ttotal is = 5N  63 Penny
