This is a math question.

12 + 2 = _________ ?

Test the calculator function by clicking the calculator at the top of the Respondus browser. You will need to enter your answer into the answer field in order to submit it.

Question

This is a math question.

12 + 2 = _________ ?

Test the calculator function by clicking the calculator at the top of the Respondus browser. You will need to enter your answer into the answer field in order to submit it.

BlackTom AI · Accepted Answer

1. Relevant knowledge points and concepts
Addition in base-10 arithmetic combines quantities by place value. A two-digit number like 12 is composed of 1 ten and 2 ones. Adding a single-digit number (2) increases the ones place; if the ones sum reaches 10 or more, you carry to the tens place. Counting by ones is an equivalent conceptual approach.

2. Complete reasoning process step by step
Treat 12 as 10 + 2. Add the extra 2 to the ones place:
- Start with 12 (which is 10 + 2).
- Add 2 more ones to the existing 2 ones.
This directly updates the ones place without needing to carry to the tens place because the ones total stays below 10.

3. Intermediate calculation steps
Write the numbers aligned by place value:
  Tens | Ones
   1   |  2   (this is 12)
   0   |  2   (this is 2)
Add the ones: 2 + 2 = 4 (ones). Add the tens: 1 + 0 = 1 (tens).
Combine tens and ones: 1 ten and 4 ones = 10 + 4 = 14.
Alternate view: 12 + 2 = (10 + 2) + 2 = 10 + (2 + 2) = 10 + 4 = 14.

4. Why the correct answer is correct
The ones place increases from 2 to 4 when two more ones are added; there is no carry because 2 + 2 = 4 (<10). The tens place remains unchanged at 1. Therefore the sum is 1 ten and 4 ones, which is 14.

5. Why other possible mistakes are incorrect
Common errors include concatenation (writing "122" by placing the 2 next to 12) or subtracting (getting 10), or adding tens incorrectly (getting 24). None of these follow place-value addition rules. Concatenation is not arithmetic; subtraction is the wrong operation; adding tens without reason misapplies place values.

6. Conclusion and confirmation
Following place-value addition yields the sum 14. This confirms the provided correct answer: 14.

This is a math question. 12 + 2 = _________ ? Test the calculator function by clicking the calculator at the top of the Respondus browser. You will need to enter your answer into the answer field in order to submit it.简答题

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