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Understanding percent conversion is crucial for many math problems. Percent conversion means expressing a number as a fraction of 100. It's like asking, 'out of 100 parts, how many are we talking about?' For example, converting 0.87 to percent involves two main steps:
First, recognize that 'percent' means 'out of 100.'
Next, multiply the original number by 100 to find out how many parts it represents out of 100. In the example of 0.87, multiplying by 100 gives you 87. So, 0.87 converted to percent is 87%. Adding the '%' symbol completes the process.

Multiplication by 100 plays a key role in percent conversion. When you multiply a number by 100, you essentially shift the decimal point two places to the right. Let's break it down step by step:
- Start with the number to be converted, like 0.87.
- Multiply by 100: \[ 0.87 \times 100 = 87 \]
This shifts the decimal two places, transforming 0.87 into 87.0.
This number, 87.0, represents 87 out of 100, giving you 87%. Always remember, multiplication by 100 lets you easily shift the decimal point to convert any number to percent.

Mathematical symbols can often be confusing, but they're just shorthand for specific mathematical operations. In the context of percent conversion, the most important symbol is '%.' Here's a simple guide:
- The % symbol stands for 'per cent,' which translates to 'out of 100.'
- When you see a number followed by %, it means that number is a fraction of 100 parts. For example, 50% is really 50 out of 100, or 0.50 in decimal form.
- To convert a decimal to percent, use the multiplication symbol (\times) and the number 100. For 0.87, it's written as\[ 0.87 \times 100 = 87 \]
Always attach the % symbol after the multiplication to indicate the final percent form. Getting comfortable with these symbols can make many math tasks easier and clearer.