Download the Lessonotes Mobile Liberia app for faster lesson access on Android and iPhone.
Subject: Mathematics
Semester: 2
Period: 5
Week: 29
School Name:
Teacher’s Name:
Subject: Mathematics
Grade Level: Grade 3
Date: Week 29
Lesson Duration: 45 minutes
Week & Period: Week 29, Period 5
Topic: Measurement
Sub-topic: Combined Operations on Measurement Units
Learning Objectives
By the end of the lesson, students should be able to:
• Add, subtract, multiply, and divide units of volume and weight
• Solve multi-step word problems involving measurement conversions
• Apply measurement in real-life contexts (cooking, farming, construction)
Previous Knowledge
Students already know single operations with measurement units.
Instructional Materials
Mathematics textbook for Grade 3, measuring tools, sample containers, real-life problem charts.
Lesson Development – ABC Model
A – Anticipation (Warm-up / Starter)
Time: 5–10 minutes
Teacher asks: “If you need 2 liters of water for cooking and already have 1 liter, how much more do you need?” Learners respond.
B – Building Knowledge (Main Lesson Body)
Time: 25–30 minutes
Teacher explains:
Combined operations mean using more than one operation (+, −, ×, ÷) in the same problem.
Examples:
- A farmer harvested 20 kg of rice. He sold 5 kg. How much is left? 20 − 5 = 15 kg
- A recipe needs 2 L of milk. For 3 cakes, total = 2 × 3 = 6 L
- A bag weighs 24 kg. If shared equally among 4 children, each gets 24 ÷ 4 = 6 kg
Learners’ Activities (Expanded):
• Learners solve word problems in groups.
• Learners measure water, divide into cups, and record.
• Learners calculate weight of objects with combined operations.
Assessment Checks:
• Teacher asks learners to solve: If a farmer has 30 kg of maize and sells 10 kg, then buys 5 kg more, how much does he have now?
Notes (Expanded & Detailed):
Combined operations require learners to think step by step. Conversions may be needed:
• 1 L = 1000 mL
• 1 kg = 1000 g
C – Consolidation (Conclusion & Assessment)
Time: 5–10 minutes
Summary: We can use addition, subtraction, multiplication, and division together to solve measurement problems.
Evaluation Method (Expanded):
Exit slip/quiz: Solve one real-life problem using at least two operations.
Assignment (Expanded):
Write and solve two word problems from your home activities using combined operations with measurement.
Follow-up Activity:
Group project: Cook simple food (e.g., rice) and record all measurements used.
Differentiation / Inclusive Strategies
Teacher groups learners so struggling learners get support. Learners use real-life objects for hands-on practice.
Teacher’s Reflection (After Class)
What worked well? ___________________________________________
What needs improvement? ____________________________________
Students’ engagement level: ☑ High ☑ Medium ☑ Low