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How to Construct Pascal's Triangle. In Pascal's Triangle, the top row is 1, with the second row just below it containing 1 and 1. To construct each subsequent row, add each pair of numbers, moving from left to right so that each number on a row is the sum of the two numbers just above it, to the right and the left.Put a 1 on both ends of each row.o construct each subsequent row, add each pair of numbers, moving from left to right so that each number on a row is the sum of the two numbers just above it, to the right and the left. Put a 1 on both ends of each row.
The image below is of the first 10 rows of Pascal's triangle in Microsoft Excel. Notice how the cell row heights and column widths have been adjusted to appear equal. This gives our values a triangular shape, and it is easier to see Pascal's triangle.e know that an entry in Pascal's triangle is the sum of two entries in the preceding row. In Excel terms, 2 (cell B2) is equal to 1 (cell A2) plus 1 (cell B1).