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36000 X 089

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Decoding 36000 x 0.89: A Step-by-Step Guide to Multiplication with Decimals



Multiplying large numbers by decimals can seem daunting, but breaking the process down into manageable steps simplifies it significantly. This article will guide you through calculating 36000 x 0.89, explaining the underlying principles and providing practical examples to enhance your understanding.

1. Understanding the Problem: What Does it Mean?



The equation 36000 x 0.89 represents finding 89% of 36000. Think of it like this: if you have 36000 apples and want to keep only 89% of them, how many apples will you have left? Multiplying by 0.89 is the mathematical way to calculate that percentage. Remember that 0.89 is equivalent to the fraction 89/100.

2. Method 1: Traditional Multiplication



This method involves ignoring the decimal point initially and then placing it correctly in the final answer.

Step 1: Ignore the decimal. Multiply 36000 by 89 as if they were whole numbers:

```
36000
x 89
---------
324000
2880000
---------
3204000
```

Step 2: Account for the decimal. Since 0.89 has two digits after the decimal point, move the decimal point in your answer (3204000) two places to the left.

```
3204000 becomes 32040.00 or simply 32040
```

Therefore, 36000 x 0.89 = 32040.


3. Method 2: Breaking Down the Decimal



This method simplifies the calculation by breaking the decimal into smaller, easier-to-handle parts.

Step 1: Multiply by 0.8. This is equivalent to multiplying by 8/10 or finding 80% of 36000. We can easily calculate 10% of 36000 as 3600. Then 80% is simply 8 times that: 3600 x 8 = 28800.

Step 2: Multiply by 0.09. This is equivalent to multiplying by 9/100 or finding 9% of 36000. We can find 1% of 36000 by dividing it by 100, which gives us 360. Then 9% is 360 x 9 = 3240.

Step 3: Add the results. Add the results from steps 1 and 2: 28800 + 3240 = 32040.

Therefore, 36000 x 0.89 = 32040.


4. Practical Examples: Applying the Knowledge



Scenario 1: Discounts. A store offers an 89% discount on a $36,000 car. The discounted price is 36000 x 0.89 = $32040.

Scenario 2: Sales Commissions. A salesperson earns an 89% commission on sales of $36,000. Their commission is 36000 x 0.89 = $32040.

Scenario 3: Area Calculation. Imagine a rectangular field with sides measuring 36000 cm and 0.89 cm. The area is 36000 x 0.89 = 32040 square cm.


5. Key Takeaways



Multiplying a large number by a decimal involves understanding the concept of percentages and applying a systematic approach. Both the traditional method and the breakdown method are effective. The choice depends on personal preference and the complexity of the problem. Always remember to account for the decimal point in your final answer.


Frequently Asked Questions (FAQs)



Q1: Can I use a calculator for this calculation? A1: Absolutely! Calculators are excellent tools for verifying your calculations, especially for more complex problems.

Q2: What if the decimal had more than two digits after the point? A2: You would follow the same procedure but move the decimal point in your answer to the left by the number of digits after the point in the decimal. For example, with 0.897, you would move it three places to the left.

Q3: Why do we move the decimal point to the left? A3: Moving the decimal point to the left is equivalent to dividing by powers of 10. Since we're multiplying by a number less than 1, the result will be smaller than the original number.

Q4: What if I am multiplying by a whole number instead of a decimal? A4: If you were multiplying by a whole number (like 89), you would simply perform the multiplication without moving the decimal point.

Q5: Are there other methods to solve this problem? A5: Yes, you could use estimation as a preliminary step to check your answer's reasonableness. For instance, 36000 x 0.9 (rounding 0.89) gives 32400. Your final answer should be close to this estimate.

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