Adding One-Digit Numbers to Two-Digit Numbers

Adding One-Digit and Two-Digit Numbers ➕

Adding one-digit numbers to two-digit numbers is a fundamental arithmetic skill. Here's a breakdown of the process with clear steps and examples.

Understanding Place Value 🏘️

Before we start, it's important to understand place value. In a two-digit number like 23, the '2' is in the tens place (representing 20), and the '3' is in the ones place.

Step-by-Step Guide 🪜

1. Write the Numbers Vertically: Align the numbers so that the ones places are directly above each other. For example, to add 5 to 23:

     23
   +  5
   ----
   

2. Add the Ones Place: Add the digits in the ones place (3 + 5 in our example):

     23
   +  5
   ----
      8
   

3. Bring Down the Tens Place: Since there's no digit to add in the tens place for the one-digit number, simply bring down the tens digit from the two-digit number:

     23
   +  5
   ----
     28
   
4. The Result: The result of adding 5 to 23 is 28.

Examples 💡

• Example 1: 12 + 6

    12
  +  6
  ----
    18
  
• Example 2: 31 + 8

    31
  +  8
  ----
    39
  

• Example 3: 64 + 5

    64
  +  5
  ----
    69
  

When the Sum of Ones is Greater Than 9 🔟

If the sum of the digits in the ones place is greater than 9, you'll need to carry over to the tens place. Let's look at an example:

• Example: 27 + 5

    27
  +  5
  ----
  

  Add the ones place: 7 + 5 = 12. Write down the '2' in the ones place and carry over the '1' to the tens place.

     1
    27
  +  5
  ----
     2
  

  Now, add the tens place, including the carry-over: 1 + 2 = 3.

     1
    27
  +  5
  ----
    32
  

  So, 27 + 5 = 32.

Practice Makes Perfect 🎯

Keep practicing with different numbers to improve your addition skills. You can also use online resources or workbooks for more practice problems.