Addition using horizontal method.

Standard: 4.NBT.B.4

Fluently add and subtract multi-digit whole numbers using the standard algorithm.

Learning Outcomes

Students will be able to apply place value knowledge to add 2- and 3-digit numbers accurately.
Students will be able to understand addition in real-life contexts by identifying when to use addition in word problems.
Students will be able to solve real-world problems by interpreting and solving word problems involving addition.
Students will be able to verify solutions by checking the reasonableness of their answers through estimation.

Download Addition using horizontal method.

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Addition:

The horizontal addition method involves writing the numbers to be added side by side (horizontally) with a plus sign (+) in between. Instead of aligning the numbers in columns, the addition is performed mentally or step-by-step by breaking it into place values.

Example 1:

Add 23 and 45.
Solution:
Write the numbers in a horizontal format:

Add the ones in place:
Add the tens place:

Final Solution:

Example 2:

Add 134 and 256.

Solution:
Write the numbers in a horizontal format:

Add the ones place:
Add the tens place:
Add the hundreds place:

Final Solution:

Why it matters:

Adding whole 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 numbers, you can solve real-world problems quickly!

Let’s practice and evaluate your work together by addition.