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Subject: Mathematics
Semester: 2
Period: 5
Week: 25
School Name:
Teacher’s Name:
Subject: Mathematics
Grade Level: Grade 3
Date: Week 25
Lesson Duration: 45 minutes
Week & Period: Week 25, Period 5
Topic: Measurement
Sub-topic: Introduction to English and Metric Systems
Learning Objectives
By the end of the lesson, students should be able to:
• Recognize and use the standard units of measurement in English and Metric systems (length, weight, capacity)
• Measure the length of classroom objects using rulers and tape measures
• Distinguish between English units (inches, pounds, gallons) and Metric units (centimeters, kilograms, liters)
Previous Knowledge
Students already know basic counting, addition, and subtraction.
Instructional Materials
Mathematics textbook for Grade 3, rulers, tape measure, weighing scale, measuring cups, classroom objects.
Lesson Development – ABC Model
A – Anticipation (Warm-up / Starter)
Time: 5–10 minutes
Teacher asks learners: “How tall are you? How heavy is your school bag? How much water do you drink in a day?” Learners share guesses and compare answers. Teacher introduces the idea that measurement helps us find accurate answers instead of guessing.
B – Building Knowledge (Main Lesson Body)
Time: 25–30 minutes
Teacher explains that measurement means finding the size, weight, or amount of something. There are two common systems of measurement:
- Metric system: centimeters (cm), meters (m), kilograms (kg), liters (L)
- English system: inches (in), feet (ft), pounds (lb), gallons (gal)
Examples:
• 1 ruler = 30 cm ≈ 12 in
• A bottle of water = 1 L ≈ 1 quart
• Your body weight may be 25 kg ≈ 55 lb
Teacher shows how to use a ruler and tape measure to find the length of classroom objects. Teacher demonstrates comparing objects using metric and English units side by side.
Learners’ Activities (Expanded):
• Learners measure their pencils, books, and desks in centimeters and inches.
• Learners weigh a school bag with a scale and compare results in kilograms and pounds.
• Learners create a chart in exercise books comparing English and Metric units.
Assessment Checks:
• Teacher asks: How many centimeters are in 1 meter? How many inches are in 1 foot?
• Teacher asks learners to measure one classroom object and report in both cm and inches.
Notes (Expanded & Detailed):
Measurement is the process of finding out the size, amount, or weight of something. The Metric system is used in most countries including Liberia and uses cm, m, L, kg. The English system is common in the USA and uses inches, feet, gallons, and pounds.
C – Consolidation (Conclusion & Assessment)
Time: 5–10 minutes
Summary: Measurement helps us compare things and solve problems accurately. There are two systems: Metric and English. We use tools like rulers, scales, and measuring cups.
Evaluation Method (Expanded):
Exit slip/quiz: Write one Metric unit and one English unit for length, weight, and capacity.
Teacher will collect slips and provide oral feedback.
Assignment (Expanded):
Measure three classroom objects at home in both Metric and English units (if possible) and record results.
Follow-up Activity:
Create a poster showing differences between Metric and English measurement.
Differentiation / Inclusive Strategies
Teacher pairs fast learners with struggling learners during measurement activities. Visual aids and real objects are used for learners with reading challenges.
Teacher’s Reflection (After Class)
What worked well? ___________________________________________
What needs improvement? ____________________________________
Students’ engagement level: ☑ High ☑ Medium ☑ Low