To express 4020 with 4 significant figures, we need to ensure that the number has exactly four non-zero digits. This can be done by adding a decimal point and additional digits if necessary.

The number 4020 to 4 significant figures would be:

**4020.**

Since it's already a 4-digit number, it retains its value. However, we include the decimal point to indicate that all four digits are significant.

Would you like more details on significant figures or have any questions?

Here are 5 related questions for further exploration:
1. How would you round 0.004020 to 4 significant figures?
2. What is 123.45 rounded to 3 significant figures?
3. How do significant figures differ from decimal places?
4. How can we determine the number of significant figures in scientific notation?
5. Why are significant figures important in scientific calculations?

**Tip:** When rounding to significant figures, zeros between non-zero digits are always significant.

Learn how to express the number 4020 using 4 significant figures. This example covers the concept of significant figures and explains how to retain accuracy by adding a decimal point. Ideal for students in Grades 7-10.

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