Final answer:
To add two numbers in a cell, use arithmetic operators and parentheses within the cell formula. For example, =10+8.3 will give you the sum of 18.3.
Step-by-step explanation:
To add two numbers in a cell, you can use the arithmetic operators and parentheses within the cell formula. For example, to add the numbers 10 and 8.3, you can enter the formula =10+8.3 in cell D11. This will give you the answer of 18.3. The addition operator (+) is used to add the numbers together.