Decimals | Substitute Teacher
Students will explore decimals as numbers with tenths and hundredths by reading, identifying, and comparing simple decimals using a number line and visual models. The lesson is designed for a substitute teacher and focuses on short, clear activities with quick checks for understanding.
| Term | Definition |
|---|---|
| decimal | A number that has a dot to show parts of a whole. |
| tenths | Ten equal parts of one whole. |
| number line | A line with numbers in order to help compare and place numbers. |
| compare | To tell which number is greater, less, or if they are equal. |
Write 0.5, 1.2, and 0.1 on the board. Say each number aloud and explain that the dot is called a decimal point. Tell students that decimals help us show parts of a whole.
Repeat the numbers aloud and point to the decimal point in each number.
Show a number line from 0 to 2. Model how 0.5 is halfway between 0 and 1, and how 1.2 is just after 1. Place one or two decimal cards on the line and talk through the thinking.
Watch, listen, and help place the cards by pointing or responding verbally.
Give students 2 to 3 decimal cards or write decimals on the board. Ask students to tell whether each decimal is closer to 0, 1, or 2, and where it belongs on the number line.
Work together to place or describe where each decimal belongs.
Ask pairs to compare two decimals, such as 0.3 and 0.7 or 1.1 and 1.4. Remind students to look at the whole number first, then the tenths.
Discuss with a partner and say which number is greater and why.
Ask each student to write one decimal, place it on a mini number line, and compare it to another decimal you choose on the board.
Complete the exit task independently and turn it in.
Review the key idea: decimals help us show parts of a whole, and we can use a number line to read and compare them. Ask students to share one new thing they learned about decimals.
Students will complete the exit task by placing one decimal on a number line and comparing it with another decimal. The teacher will check for correct placement and comparison using student responses and completed work.
Draw a number line from 0 to 2 at home. Write three decimals on it, then circle the greatest decimal and underline the least decimal.