#### Step 1: Select the Cells You Want to Sum

The first step in summing in Excel is to select the cells that you want to include in your sum. You can do this by clicking and dragging your mouse over the cells or by holding down the "Shift" key and pressing the arrow keys on your keyboard to select a range of cells. Once you've selected the cells, you'll see them highlighted.

#### Step 2: Enter the Sum Formula

Once you've selected the cells you want to sum, you can enter the sum formula. To do this, type **=SUM(** into the cell where you want the sum to appear. Then, select the cells you want to sum and press Enter. The sum will appear in the cell where you entered the formula.

#### Step 3: Use the AutoSum Feature

If you don't want to enter the sum formula manually, you can use the AutoSum feature. Select the cells you want to sum and press the "AutoSum" button on the ribbon. Excel will automatically enter the sum formula for you and calculate the sum.

#### Step 4: Use the SUM Function

You can also use the SUM function to sum in Excel. Type **=SUM(** into the cell where you want the sum to appear, select the cells you want to sum, and press Enter. The sum will appear in the cell where you entered the formula.

#### Step 5: Use the SUMIF Function

The SUMIF function allows you to sum only the cells that meet certain criteria. For example, you could use the SUMIF function to sum only the cells that contain a number greater than 10. To use the SUMIF function, type **=SUMIF(** into the cell where you want the sum to appear, select the cells you want to sum, enter the criteria, and press Enter.

#### Step 6: Use the SUMIFS Function

The SUMIFS function allows you to sum only the cells that meet multiple criteria. To use the SUMIFS function, type **=SUMIFS(** into the cell where you want the sum to appear, select the cells you want to sum, enter the criteria, and press Enter.

#### Step 7: Use the COUNT Function

The COUNT function allows you to count the number of cells that contain a number. To use the COUNT function, type **=COUNT(** into the cell where you want the count to appear, select the cells you want to count, and press Enter.

#### Step 8: Use the COUNTA Function

The COUNTA function allows you to count the number of cells that contain any data. To use the COUNTA function, type **=COUNTA(** into the cell where you want the count to appear, select the cells you want to count, and press Enter.

#### Step 9: Use the COUNTIF Function

The COUNTIF function allows you to count the number of cells that meet certain criteria. To use the COUNTIF function, type **=COUNTIF(** into the cell where you want the count to appear, select the cells you want to count, enter the criteria, and press Enter.

#### Step 10: Use the COUNTIFS Function

The COUNTIFS function allows you to count the number of cells that meet multiple criteria. To use the COUNTIFS function, type **=COUNTIFS(** into the cell where you want the count to appear, select the cells you want to count, enter the criteria, and press Enter.

By following these steps, you can perform various types of calculations in Excel, from simple sums to more complex conditional sums and counts.