Definition:

To find the total, adding 2-digit numbers with three addends involves summing three numbers, each consisting of two digits. This process strengthens arithmetic skills and helps students understand combining multiple values.

Example 1:

Add 23+45+32.

Solution:

• Add the first two numbers: 23+45=68
• Add the result to the third number: 68+32=100

Answer: 23+45+32=100

Example 2:

Add 51+42+36.

Solution:

• Add the first two numbers: 51+42=93
• Add the result to the third number: 93+36=129

Answer: 51+42+36=129

Example 3:

Add 62+34+29.

Solution:

• Add the first two numbers: 62+34=96
• Add the result to the third number: 96+29=125

Answer: 62+34+29=125

Example 4:

Add 78+45+21.

Solution:

• Add the first two numbers: 78+45=123
• Add the result to the third number: 123+21=144

Answer: 78+45+21=144

Why it matters:

Learning to add 2-digit numbers with three addends helps students strengthen their problem-solving and arithmetic skills. It builds a foundation for tackling more complex calculations and real-world problems, such as budgeting or combining measurements. This skill fosters logical thinking and improves 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 two-digit numbers.