# How to Sum Numbers in Odd Rows

You can use the SUMPRODUCT and MOD functions to have the sum of the numbers in the odd rows.

Example: You are working with a worksheet with the product in column A, the amount in column B, and the profit/loss in column C.

Question: What is the sum of numbers in odd rows in column B?

=SUMPRODUCT(MOD(ROW(B2:B10),2), B2:B10)

The result returns 2,100.

Explanation:

• Step 1: ROW(B2:B10): To have the row number;
• Step 2: MOD(ROW(B2:B10),2): To have the remainder when the row number divides two. The remainder returns one when the odd row number divides two;
• Step 3: The SUMPRODUCT function returns the sum of the products of the new array and the range B2:B10.

You can use the following formula to have the sum of the numbers in column C in the odd rows.

=SUMPRODUCT(MOD(ROW(B2:B10),2), C2:C10)

The result returns -3,544.

Notes: The SUMPRODUCT Function

The SUMPRODUCT function adds all the multiplication results for all arrays.

Formula:

=SUMPRODUCT(array1, [array2], …)

Explanations:

– Array1 is required; the first array is to multiply and add.
– Array2 is optional; the second array is to multiply and add.