Addition of 1 and 2 digits:

The addition of one-digit numbers involves adding two numbers, each containing a single digit in one place. The process is straightforward, as there is only one place value (ones) to consider. Sometimes, the sum may be greater than 9, which introduces regrouping (carrying over) to the next place value, but often it does not require regrouping.

Step-by-Step Process:

1. Write the two 1-digit numbers vertically, aligning them by place value.
2. Add the numbers in the ones place.
3. If the sum is greater than 9, carry over the extra value to the tens place.

Example 1:

Without regrouping, add 4 and 3.

Solution:

• Write the numbers vertically:4+3
• Add the ones place:
• 4 + 3 = 7.

Final solution: 4 + 3 = 7.

Example 2:

With regrouping, add 8 and 7.

Solution:

• Write the numbers vertically: 8+7
• Add the ones place:
  • 8 + 7 = 15. Write 5 in the ones place and carry over 1 to the tens place.
• Since this is a single-digit addition, the 1 (tens place) is the next value.
• Final solution: 8 + 7 = 15.

Example 3:

Problem: Jake has 6 apples, and his friend gives him 2 more. How many apples does Jake have now?

Solution:

• Write the numbers vertically:
• Add the ones place:
  • 6 + 2 = 8.
• Final solution: 6 + 2 = 8. Jake now has 8 apples.

Why it matters:

Adding 2-digit numbers is a fundamental math skill that helps solve everyday problems, from calculating expenses to measuring quantities. It builds a strong foundation for advanced arithmetic concepts like multiplication and division. Mastering addition improves problem-solving, logical thinking, and mental math abilities.

By practicing addition with 2-digit numbers, you can solve real-world problems quickly!

Let’s practice and evaluate your work together by adding 2-digit numbers.