Objectives for this lesson:
1.
Given decimal problems and teacher-led examples, students will explain the algorithm for adding and subtracting decimals using correct mathematical language with at least 80% accuracy.
2.
Using place-value charts or written algorithms, students will correctly apply the algorithm to add and subtract decimals with at least 80% accuracy.
3.
During guided and independent practice activities, students will show confidence and willingness to attempt decimal addition and subtraction problems by attempting all assigned problems and participating actively in class activities.
Important terms to remember
Decimals
Decimals are numbers that show parts of a whole using a decimal point.
Decimals help us show small parts of a number.
Instead of cutting something into fractions, we use a dot to show the parts.
👉 Examples:
0.5 means half
1.25 means one whole and some extra
3.6 means three and a bit more
🧠 Think:
“Decimals show pieces of a number.”
Decimal Point
A decimal point is a dot that separates the whole number from its parts.
The decimal point is a little dot that tells us where the whole numbers stop and the small parts begin.
👉 Example:
In 4.7
4 is the whole number
.7 is the part
🧠 Think:
“The dot splits the whole and the pieces.”
Watch this Video!
Group Activity
How to work together:
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Work in groups of three.
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Talk about each problem before writing the answer.
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One person types, another checks, and another explains the steps.
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Show working for every question.
