To change decimals into percentages quickly, there’s a simple way to do it! Just remember to multiply the decimal by 100, and then add a percentage sign at the end.

Here’s a step-by-step guide:

1. Find the Decimal: For example, let’s use $0.75$.
2. Multiply by 100: You do $0.75 \times 100$, which equals $75$.
3. Add the Percentage Sign: So, you write $75\%$.

Examples:

• For $0.4$:
  • Multiply $0.4 \times 100$ to get $40$. So, $0.4$ is $40\%$.
• For $0.025$:
  • Multiply $0.025 \times 100$ to get $2.5$. This means $0.025$ is $2.5\%$.

Quick Tips:

• Move the Decimal: You can also just move the decimal point two spaces to the right. For instance, $0.85$ becomes $85$ when you shift it to $85.0$.
• For Whole Numbers: If you have a decimal like $1.2$, that turns into $120\%$ when you multiply by $100$.

With this method, you can easily change decimals into percentages for your math problems!