The notation "1.78E12" is a way to express numbers in scientific notation. In this case, "E" stands for "exponent" and indicates that the number should be multiplied by 10 raised to the power of 12.
So, "1.78E12" can be interpreted as:
\[ 1.78 \times 10^{12} \]
This means that the number represented is 1.78 multiplied by 1 trillion (since \(10^{12}\) is 1,000,000,000,000).
In decimal form, this number is:
\[ 1.78 \times 1,000,000,000,000 = 1,780,000,000,000 \]
Therefore, Charlee's calculator is displaying a result of 1,780,000,000,000, which is a little over 1.78 trillion.