Mastering Addition and Subtraction of 1s, 10s, 100s, and 1,000s

Mastering Addition and Subtraction of 1s, 10s, 100s, and 1,000s

Learning Objective

At the end of the lesson, you will be able to add and subtract numbers by understanding how to partition them.

What do you already know about adding and subtracting numbers?

Introduction

Why is it important to learn how to add and subtract numbers? Think about situations where you might need to use these skills.

Place Value

Understanding place value is crucial for adding and subtracting numbers. Numbers are made up of digits that represent different place values.

Partitioning Numbers

Partitioning numbers means breaking them down into their place value components. For example, 532 can be partitioned as 500 + 30 + 2.

Adding 1s

To add 1s, simply combine the ones place values of the numbers being added. For example, 7 + 9 = 16.

Adding 10s

When adding 10s, combine the tens place values and carry over any additional value to the next place. For example, 40 + 30 = 70.

Adding 100s

Adding 100s involves combining the hundreds place values, carrying over any additional value to the next place. For example, 300 + 400 = 700.

Adding 1,000s

To add 1,000s, combine the thousands place values and carry over any additional value to the next place. For example, 1,000 + 2,000 = 3,000.

Subtraction

Subtraction follows a similar process. Start with the largest place value and subtract accordingly, borrowing when necessary.

Write down 3 things you learned in this lesson.

Have students enter three things they learned in this lesson. With this they can indicate their own learning efficiency of this lesson.

Write down 2 things you want to know more about.

Here, students enter two things they would like to know more about. This not only increases involvement, but also gives them more ownership.

Ask 1 question about something you haven't quite understood yet.

The students indicate here (in question form) with which part of the material they still have difficulty. For the teacher, this not only provides insight into the extent to which the students understand/master the material, but also a good starting point for the next lesson.