To convert 4.2 into a percentage, multiply it by 100:

\[
4.2 \times 100 = 420\%
\]

So, 4.2 as a percentage is **420%**.

Would you like further details on percentage conversion or have any other questions?

Here are five related questions you might find useful:
1. How do you convert a percentage back to a decimal?
2. What is 0.75 as a percentage?
3. How would you express 7.5% as a decimal?
4. Can percentages be greater than 100%, and what does that mean?
5. How would you calculate 20% of a number?

**Tip:** Percent means "per hundred," so converting a decimal to a percentage is simply multiplying by 100!

Learn how to convert 4.2 into a percentage by multiplying it by 100. This problem covers essential concepts such as percentage conversion and understanding decimals. Suitable for students in Grades 5-7.

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