What percent is :
450 m of 2.5 km

Answer

To find out what percent 450 m is of 2.5 km, we can follow these steps:

### Step 1: Convert kilometers to meters
We need to convert 2.5 kilometers into meters because the two measurements must be in the same unit.

1 kilometer = 1000 meters, so:
\[ 2.5 \text{ km} = 2.5 \times 1000 \text{ m} = 2500 \text{ m} \]

### Step 2: Set up the percentage formula
To find what percent 450 m is of 2500 m, we can use the percentage formula:
\[ \text{Percentage} = \left( \frac{\text{Part}}{\text{Whole}} \right) \times 100 \]
Here, the part is 450 m and the whole is 2500 m.

### Step 3: Substitute the values into the formula
Substituting the values into the formula gives us:
\[ \text{Percentage} = \left( \frac{450}{2500} \right) \times 100 \]

### Step 4: Simplify the fraction
Now we simplify the fraction:
\[ \frac{450}{2500} = \frac{450 \div 50}{2500 \div 50} = \frac{9}{50} \]

### Step 5: Multiply by 100
Now, we multiply by 100 to convert it into a percentage:
\[ \text{Percentage} = \left( \frac{9}{50} \right) \times 100 = \frac{900}{50} = 18 \]

### Conclusion
Thus, 450 m is 18% of 2.5 km.

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