Lesson Notes By Weeks and Term v3 - Primary 1

Lesson Video

This page supports the lesson note with a companion video and a short classroom-ready summary.

Performance objectives

• and evaluation guide.
• Find the missing number in each statement:
• a) 5 + ? = 8
• b) ? + 2 = 7
• c) 4 + ? = 9

Lesson summary

This lesson focuses on developing students' understanding of addition beyond simple sums by introducing the concept of finding missing numbers in addition statements and the importance of cross-checking their calculations. These skills are fundamental for building strong number sense and fostering accuracy in mathematical operations. The ability to find missing numbers helps students understand the inverse relationship between addition and subtraction, while cross-checking ensures precision, a critical skill in daily life transactions and problem-solving within the Nigerian context.

Teacher activity

• Guides pupils to take a set of objects and constitute two groups of known unequal numbers.
• Guides pupils to count the smaller group and determine the number of objects to be added to obtain the number in the bigger groups e.g.8 + _= 9
• Emphasizes the need for correct addition everyday activities.
• Guides pupils to give examples of everyday activities where accuracy of addition is needed.

Evaluation guide

• Observation: The teacher will observe students during group activities, noting their ability to use manipulatives to solve missing number problems and their engagement in cross-checking.
• Question & Answer: Ask targeted questions during explanations and guided practice to assess understanding (e.g., "How did you find the missing number?", "Why is it important to check your answer?").
• Mini-whiteboards/Slates: Students can quickly write answers to missing number problems or demonstrate a cross-checking step on their slates, allowing the teacher to gauge whole-class understanding instantly.
• Use the following questions, directly aligned with the performance objectives and evaluation guide.
• Find the missing number in each statement:

Reference guide

• Pebbles
• Or anges
• balls
• Bottle to ps
• Number Beads, etc