Quick explanation:
Brief explanation: To add two numbers, we align them vertically by place value and add each column starting from the right, carrying over when a sum exceeds 9.
Step-by-step solution:
- Step 1: Add the ones column: 4 + 5 = 9.
- Step 2: Add the tens column: 7 + 8 = 15. Write down 5 and carry over 1 to the hundreds column.
- Step 3: Add the hundreds column: 2 + 3 + 1 (carry-over) = 6.
Answer: 659