1. **State the problem:** We want to teach how to add two numbers using addition by regrouping (also called carrying). 2. **Explain the concept:** Addition by regrouping is used when the sum of digits in one place value is 10 or more. We carry over the extra value to the next place value. 3. **Example:** Add 27 + 58. 4. **Step 1:** Add the ones place digits: $7 + 8 = 15$. 5. **Step 2:** Since 15 is greater than 9, write down 5 in the ones place and carry over 1 to the tens place. 6. **Step 3:** Add the tens place digits plus the carried over 1: $2 + 5 + 1 = 8$. 7. **Step 4:** Write down 8 in the tens place. 8. **Final answer:** $27 + 58 = 85$. 9. **Summary:** When the sum in a place value is 10 or more, write down the digit in the ones place of the sum and carry the tens digit to the next higher place value. This method helps learners understand place value and how numbers combine in addition.