Scientific notation to express 690 of one significant figures

To express **690** in scientific notation to **one significant figure**, we round it to the nearest significant figure and then convert it.

1. **Round 690 to one significant figure**:  
   The closest number with one significant figure is **700**.

2. **Convert 700 to scientific notation**:  
   \( 700 = 7 \times 10^2 \)

So, **690** expressed to one significant figure in scientific notation is **\( 7 \times 10^2 \)**.

Do you want further details or have any questions?

Here are five related questions you might find helpful:
1. How do you convert any number to scientific notation?
2. What are significant figures, and why are they important?
3. How would you express a smaller number like 0.0069 in scientific notation?
4. How do significant figures affect rounding in complex calculations?
5. How can you multiply or divide numbers in scientific notation?

**Tip:** Always check the place of the first non-zero digit when rounding to significant figures!

Understand how to express the number 690 in scientific notation to one significant figure. This tutorial covers key concepts such as scientific notation and rounding to significant figures, suitable for students in Grades 6-8.

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