3 Digit Addition

3 digit addition is a mathematical operation that involves adding three-digit numbers together. When performing 3 digit addition, it's important to align the numbers properly and add the digits in each place value (ones, tens, hundreds) from right to left.

Example:

Let's add the following two numbers: 245 and 378.

    245
  + 378
  ------
    623

In this example, we add the ones column (5 + 8 = 13), carry over the tens place value (1), add the tens column (4 + 7 + 1 = 12), carry over the hundreds place value (1), and finally add the hundreds column (2 + 3 + 1 = 6), giving us the sum of 623.

Carrying Over:

When the sum of the digits in a column is greater than 9, we carry over the extra value to the next column on the left. This is an important concept to remember when adding 3 digit numbers.

Practice:

Now that you understand the concept, try practicing 3 digit addition with different numbers to reinforce your understanding.

With practice, you'll become more comfortable with 3 digit addition and be able to solve problems quickly and accurately.

◂Math Worksheets and Study Guides Third Grade. 3 Digit Addition

The resources above cover the following skills:

Number and Operations (NCTM)

Compute fluently and make reasonable estimates.

Develop fluency in adding, subtracting, multiplying, and dividing whole numbers.

Select appropriate methods and tools for computing with whole numbers from among mental computation, estimation, calculators, and paper and pencil according to the context and nature of the computation and use the selected method or tools.

Algebra (NCTM)

Use mathematical models to represent and understand quantitative relationships.

Model problem situations with objects and use representations such as graphs, tables, and equations to draw conclusions.

Connections to the Grade 3 Focal Points (NCTM)

Number and Operations: Building on their work in grade 2, students extend their understanding of place value to numbers up to 10,000 in various contexts. Students also apply this understanding to the task of representing numbers in different equivalent forms (e.g., expanded notation). They develop their understanding of numbers by building their facility with mental computation (addition and subtraction in special cases, such as 2,500 + 6,000 and 9,000 - 5,000), by using computational estimation, and by performing paper-and-pencil computations.

3 Digit Addition

Example:

Carrying Over:

Practice:

[3 Digit Addition] Related Worksheets and Study Guides:

◂Math Worksheets and Study Guides Third Grade. 3 Digit Addition

The resources above cover the following skills: