Open Sentence Basic 4 Mathematics Lesson Note

SPECIFIC OBJECTIVES:

At the end of the lesson, pupils should be able to:

1. ) Illustrate and explain the term open sentence.
2. ) Predict the missing numbers in an open sentence.
3. ) Write and solve equations based on open sentences.
4. ) Solve quantitative reasoning problems involving open sentences.

INSTRUCTIONAL TECHNIQUES: 

• Explanation, 
• class discussion, 
• hands-on activities, 
• problem-solving. 

INSTRUCTIONAL MATERIALS: 

• Flashcards, 
• board, 
• worksheets, 
• story prompts.

INSTRUCTIONAL PROCEDURES

PERIOD 1 and 2:

NOTE:

• An open sentence has a variable (like x or y) that needs to be solved.
• Example: x + 3 = 8 → x = 8 – 3 → x = 5.

EVALUATION:

1. Solve for x: x + 4 = 10.
2. Solve for y: 5 × y = 25.

CLASSWORK:

1. Solve: x + 6 = 14.
2. Solve: 7 × y = 28.

ASSIGNMENT:

1. Solve: x + 2 = 10.
2. Solve: 9 × y = 45.

PERIOD 3 and 4:

NOTE:

• Story problems can be written as open sentences that need to be solved.
• Example: John + 3 = 10 → John = 10 – 3 → John = 7 apples.

EVALUATION:

1. Write an open sentence for the problem: “Jane has 5 chocolates. She buys 4 more. How many chocolates does she have now?”
2. Solve for the missing number: 6 + x = 14.

CLASSWORK:

1. Create an open sentence for the problem: “Tom had 8 pencils. He gave 3 pencils to his friend. How many pencils does he have left?”
2. Solve for x: 5 + x = 12.

ASSIGNMENT:

1. Write an open sentence for the problem: “Mary has some marbles. She buys 5 more. Now she has 13 marbles. How many marbles did she have originally?”
2. Solve for x: 10 – x = 6.

PERIOD 5:

NOTE:

• Open sentences help us find unknowns in everyday problems.
• Example: You have 15 Naira, buy an item for 10 Naira, how much change do you get?
• Answer: 15 – 10 = 5 Naira.

EVALUATION:

1. Solve for x: 10 + x = 15.
2. Solve for y: 5 × y = 25.

CLASSWORK:

1. Write an open sentence for this problem: “You have 3 toys, and you buy 2 more. How many toys do you have now?”
2. Solve for y: 4 + y = 12.

ASSIGNMENT:

1. Write an open sentence for this problem: “You have 10 pencils, and you give 4 to your friend. How many pencils do you have left?”

Solve for x: 8 + x = 14.