Here is an activity to practice using spreadsheet formulas:

1. Open a blank spreadsheet in your preferred spreadsheet software (such as Microsoft Excel or Google Sheets).

2. Create a table with the following columns: Item, Quantity, Price, and Total.

3. In the “Item” column, list a few items that you want to calculate the total cost for. For example, you can list “Apples”, “Bananas”, and “Oranges”.

4. In the “Quantity” column, enter the quantity of each item you want to purchase. For example, you can enter 5, 3, and 2 for the respective items.

5. In the “Price” column, enter the price of each item. For example, you can enter $0.50, $0.25, and $0.75 for the respective items.

6. In the “Total” column, use a formula to calculate the total cost for each item. For example, you can use the formula “=Quantity*Price” to calculate the total cost for each item.

7. Drag the formula down to apply it to all the rows in the “Total” column.

8. Finally, use another formula to calculate the overall total cost of all the items. You can use the formula “=SUM(Total)” to add up all the values in the “Total” column.

9. Play around with the quantities and prices to see how the total cost changes.

This activity will help you practice using basic spreadsheet formulas to perform calculations and analyze data.