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Subject: Mathematics
Semester: 1
Period: 2
Week: 9
School Name:
Teacher’s Name:
Subject: Mathematics
Grade Level: Grade 3
Date: Week 9
Lesson Duration: 45 minutes
Week & Period: Week 9, Period 2
Topic: Expanded Notation for 3- and 4-digit Numbers
Sub-topic: Writing numbers in expanded and standard forms
Learning Objectives
By the end of the lesson, students should be able to:
Write 3- and 4-digit numbers in expanded form
Convert expanded notation back to standard form
Explain the connection between place value and expanded notation
Previous Knowledge
Students already understand place value of ones, tens, hundreds, and thousands
Instructional Materials
Mathematics textbook for Grade 3, flashcards, number line, place value chart
Lesson Development – ABC Model
A – Anticipation (Warm-up / Starter)
Time: 5–10 minutes
The teacher asks learners to break down 456 into hundreds, tens, and ones. Learners respond with 400 + 50 + 6.
B – Building Knowledge (Main Lesson Body)
Time: 25–30 minutes
The teacher defines expanded notation as writing a number according to the value of each digit. Example:
625 = 600 + 20 + 5
3248 = 3000 + 200 + 40 + 8
The teacher shows that expanded form makes it easier to understand the size of each digit. Learners practice matching numbers with their expanded forms using flashcards.
Learners’ Activities (Expanded)
Students match numeral cards with expanded form cards. Learners practice writing numbers like 789, 1423, 5067 in expanded form. Groups compete in writing standard forms from expanded expressions.
Assessment Checks
Write 431 in expanded form
Convert 3000 + 500 + 40 + 2 into standard form
Explain why 609 is written as 600 + 0 + 9
Notes (Expanded & Detailed)
Expanded form is built on place value. It shows the actual value of digits, making large numbers easier to understand. Example: 5021 = 5000 + 0 + 20 + 1.
C – Consolidation (Conclusion & Assessment)
Time: 5–10 minutes
Summary: The teacher reviews standard and expanded notation and reinforces their connection to place value.
Evaluation Method (Expanded)
Exit slip/quiz: Write 2479 in expanded form.
Assignment (Expanded)
Write in expanded form: 896, 4305
Write in standard form: 5000 + 700 + 60 + 9
Follow-up Activity
Students prepare 5 pairs of numbers (standard ↔ expanded) for their classmates to solve.
Differentiation / Inclusive Strategies
Provide simpler 3-digit numbers for struggling learners. Advanced learners handle 4-digit numbers with zeros in middle places.
Teacher’s Reflection (After Class)
What worked well? ___________________________________________
What needs improvement? ____________________________________
Students’ engagement level: ☑ High ☑ Medium ☑ Low