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Let's solve each part of the question in detail:

**a) Write \( 1.54 \times 10^4 \) as an ordinary number.**

To convert from scientific notation to an ordinary number, move the decimal point to the right by the power of 10:
- \( 1.54 \times 10^4 = 15400 \).

**b) Write \( 5.09 \times 10^{-3} \) as an ordinary number.**

For a negative exponent, move the decimal point to the left by the power of 10:
- \( 5.09 \times 10^{-3} = 0.00509 \).

**c) Write 540000 in standard form.**

To express in scientific notation, place the decimal after the first non-zero digit and count the places:
- \( 540000 = 5.4 \times 10^5 \).

**d) Write 0.000869 in standard form.**

Move the decimal after the first non-zero digit:
- \( 0.000869 = 8.69 \times 10^{-4} \).

### Summary of Answers:
- **a)** \( 15400 \)
- **b)** \( 0.00509 \)
- **c)** \( 5.4 \times 10^5 \)
- **d)** \( 8.69 \times 10^{-4} \)

Would you like more details or have any questions?

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Here are some related questions to practice:

1. Convert \( 3.7 \times 10^6 \) to an ordinary number.
2. Write \( 0.00034 \) in standard form.
3. Convert \( 8.5 \times 10^{-2} \) to an ordinary number.
4. Write 67000000 in standard form.
5. Express \( 4.56 \times 10^{-4} \) as an ordinary number.

**Tip:** When converting from scientific notation, remember that a positive exponent moves the decimal to the right, while a negative exponent moves it to the left.

a) Write 1.54 × 10^4 as an ordinary number.

b) Write 5.09 × 10^-3 as an ordinary number.

c) Write 540000 in standard form.

d) Write 0.000869 in standard form.

Learn how to convert scientific notation to ordinary numbers and vice versa with example questions like writing 1.54 × 10^4 and 5.09 × 10^-3 as ordinary numbers, and 540000 and 0.000869 in standard form. Suitable for Grades 6-8 students.

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