Question: Convert this decimal into a percent. 0.45 = [?]%

1. **State the problem:** Convert the decimal $0.45$ into a percent. 2. **Recall the formula:** To convert a decimal to a percent, multiply the decimal by 100 and add the percent symbol \%. 3. **Apply the formula:** $$0.45 \times 100 = 45$$ 4. **Write the answer:** $$0.45 = 45\%$$ 5. **Explanation:** Multiplying by 100 shifts the decimal point two places to the right, converting the decimal to a percentage value. **Final answer:** $45\%$