To express $1.98 \times 10^4$ in standard form, we need to rewrite it as a number between 1 and 10 multiplied by a power of 10.

The given expression $1.98 \times 10^4$ is already in scientific notation (which is another way of writing standard form), where:

• The coefficient (1.98) is between 1 and 10.
• The exponent (4) shows how many places the decimal point is shifted.

In standard form, the expression remains the same, since $1.98 \times 10^4$ is already in the correct format.

Thus, 1.98 × 10^4 is in standard form.

Would you like further clarification on scientific notation or any other questions?

Here are some follow-up questions:

1. How do you convert a number from scientific notation to standard form?
2. What is the difference between scientific notation and standard form?
3. How do you express $0.000345$ in scientific notation?
4. How do you add numbers in scientific notation?
5. How do you multiply numbers in scientific notation?

Tip: When dealing with scientific notation, remember that the exponent tells you how many places to move the decimal point to get the standard number. Positive exponents shift right, and negative exponents shift left!