How do you write 5.2 trillion in standard notation?

To write 5.2 trillion in standard notation, you express it as a number followed by the appropriate number of zeros. Since one trillion is equal to 1,000,000,000,000, you multiply 5.2 by 1 trillion: 5.2 × 1,000,000,000,000. Therefore, 5.2 trillion in standard notation is written as 5,200,000,000,000.