Decimals - Adding Decimals within 1 - Presentation

The lesson on adding decimals within one whole introduces students to the concept of decimal addition using a variety of teaching aids and activities. Initially, the students are prompted to consider different written methods for addition and how these might assist with adding decimals. They are encouraged to use a place value chart as a visual aid to understand the position of ones, tenths, hundredths, and thousandths. The activities challenge students to identify the number represented on the chart, calculate the addition of a given decimal, and determine the effect of adding more thousandths on the hundredths digit. These exercises are designed to reinforce the understanding of decimal place values and the process of decimal addition.

Further activities involve the use of a hundred square, where each box represents one hundredth of a whole, to visually demonstrate the addition of decimals. This representation helps students grasp the concept of how decimals combine to form whole numbers. The lesson also introduces column addition as a method to support the addition of decimals, providing a structured approach to ensure accuracy. Students are given a series of calculations to solve using column addition, which helps them to see the alignment of decimal places clearly. Reasoning tasks are incorporated to challenge students' understanding, such as identifying and correcting mistakes in decimal addition and comparing number sentences using inequality signs. The lesson culminates with independent work that includes true or false statements and calculations represented in multiple ways, promoting a deeper comprehension of decimal addition.