Fill in the missing number. 30% of = 12
Understand the Problem
The question is asking to find a missing number such that 30% of that number equals 12. To solve this, we can set up the equation: 0.30 * x = 12, where x is the missing number. We will solve for x.
Answer
The missing number is $40$.
Answer for screen readers
The missing number is $40$.
Steps to Solve
- Set up the equation
We start with the equation based on the information provided. Since we know that 30% of a number $x$ equals 12, we can express this mathematically as:
$$ 0.30 \cdot x = 12 $$
- Isolate the variable
To find the value of $x$, we need to isolate it by dividing both sides of the equation by 0.30:
$$ x = \frac{12}{0.30} $$
- Calculate the value
Now we can compute the right-hand side:
$$ x = \frac{12}{0.30} = 40 $$
The missing number is $40$.
More Information
This result means that if you take 30% of 40, you will get 12. This type of problem is common in percentage calculations, often found in real-life situations like discounts or statistics.
Tips
- Confusing percentage with decimal form: Remember that 30% is the same as 0.30.
- Failing to isolate the variable correctly: Always ensure you are properly solving for $x$ by using algebraic principles.
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