1. perform the indicated addition. 2,580+675+36= 3,291 is this correct?

2. perform the indicated subtraction. 44,377-25,058=19,319 is this correct?
3.312x371= 3,432 is this correct?

The first two are correct.

But the last one cannot be correct. 300 * 300 must equal 9 or 10 something.

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To verify the correctness of the calculations, let's go through the steps for each problem:

1. Addition: 2,580 + 675 + 36
- Start by adding the rightmost digits (the ones place): 0 + 5 + 6 = 11. Write down the 1 and carry over the 1.
- Next, add the digits in the tens place: 8 + 7 + 3 (the carried-over 1) = 19. Write down the 9 and carry over the 1.
- Finally, add the hundreds places: 2 + 6 + 1 (carried-over 1) = 9. Write down the 9.
- The sum is 3,291, which matches the result you provided. Therefore, it is correct.

2. Subtraction: 44,377 - 25,058
- Start by subtracting the rightmost digits (the ones place): 7 - 8. Since 7 is smaller than 8, we have to borrow from the tens place.
- Borrowing 1 from the 4 in the tens place, we have 17 - 8 = 9.
- Next, subtract the tens places: 7 (after borrowing) - 5 = 2.
- Finally, subtract the hundreds and thousands places: 3 - 2 = 1, 4 - 0 = 4, 4 - 2 = 2.
- The difference is 19,319, which matches your result. Therefore, it is correct.

3. Multiplication: 312 x 371
- Start by multiplying the rightmost digits (the ones place): 2 x 1 = 2.
- Next, multiply the digits in the tens place: 1 x 7 = 7.
- Then, multiply the digits in the hundreds place: 3 x 3 = 9.
- Finally, calculate the product of each place value and add them together:
- In the ones place: 2
- In the tens place: 7 (shifted one place to the left)
- In the hundreds place: 9 (shifted two places to the left)
- Combine the results: 9,072. Therefore, 3,312 x 371 is not equal to 3,432. The correct product is 9,072.