To find the mistake that Darko made, we'll first correctly calculate the sum of 324 and 57.
- Align the numbers for addition:
324
+ 57
- Add the numbers column by column, starting from the right:
- In the ones place: \(4 + 7 = 11\). Write down 1 and carry over 1.
- In the tens place: \(2 + 5 = 7\), plus the 1 we carried over gives us \(8\).
- In the hundreds place: \(3 + 0 = 3\).
So, putting it all together:
324
+ 57
______
381
The correct sum of 324 and 57 is 381.
Now, Darko claimed the sum was 894, which is incorrect. The most likely error Darko made could involve multiple digits being added incorrectly, such as mistaking the numbers or mishandling the carrying process.
To summarize, the error made by Darko was in his calculation or addition process, resulting in the incorrect sum of 894 instead of the correct sum of 381.