Divide 100 by half and add 20.
Understand the Problem
The question is asking us to perform a mathematical calculation where we first divide 100 by half (which is equivalent to multiplying by 2) and then add 20 to the result.
Answer
220
Answer for screen readers
The final answer is 220.
Steps to Solve
- Divide 100 by half
To divide 100 by half, notice that dividing by a fraction is the same as multiplying by its reciprocal. Half is $\frac{1}{2}$, so dividing by half means multiplying by 2.
[ 100 \div \frac{1}{2} = 100 \times 2 = 200 ]
- Add 20 to the result
Now, take the result from the previous step and add 20 to it.
[ 200 + 20 = 220 ]
The final answer is 220.
More Information
When you divide a number by a fraction, it can often lead to surprising results, like this problem where dividing by half effectively doubles the number!
Tips
- A common mistake is to simply write down the division without considering that dividing by a half actually means multiplying by 2. To avoid this, always remember to convert division by a fraction into multiplication by its reciprocal.
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