Mathematics - Primary 4 - Estimation

Estimation

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Term: 2nd Term

Week: 6

Class: Primary 4
Age: 9 years
Duration: 40 minutes of 5 periods
Date:
Subject: Mathematics
Topic: Estimation

SPECIFIC OBJECTIVES:

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

  1. ) Identify actual numbers and estimate values.
  2. ) Calculate the addition and subtraction of rounded-up numbers.
  3. ) Interpret and solve real-life problems using estimation.
  4. ) Solve quantitative reasoning problems involving estimation.

INSTRUCTIONAL TECHNIQUES: Explanation, class discussion, hands-on activities, problem-solving.
INSTRUCTIONAL MATERIALS: Number charts, flashcards, board, worksheets.

INSTRUCTIONAL PROCEDURES

PERIOD 1 and 2:

PRESENTATION

TEACHER’S ACTIVITY

PUPIL’S ACTIVITY

STEP 1 – INTRODUCTION

Introduces estimation and its importance in everyday life.

Pupils listen and participate in discussion.

STEP 2 – EXPLANATION

Explains how to round numbers to the nearest ten, hundred, etc., for estimation.

Pupils follow along and round numbers to the nearest ten.

STEP 3 – DEMONSTRATION

Demonstrates estimation by rounding numbers to perform addition and subtraction.

Pupils practice rounding and adding or subtracting rounded numbers.

STEP 4 – NOTE TAKING

Pupils take notes on rounding and estimation methods.

Pupils write down examples and the rules for rounding numbers.

NOTE:

  • To estimate: Round the numbers to a convenient place value (nearest ten, hundred) and perform the operation.

EVALUATION:

  1. Estimate the sum of 48 and 62 by rounding to the nearest ten.
  2. Estimate the difference between 94 and 58 by rounding to the nearest ten.

CLASSWORK:

  1. Estimate 67 + 45 by rounding to the nearest ten.
  2. Estimate 83 – 36 by rounding to the nearest ten.

ASSIGNMENT:

  1. Estimate 129 + 38 by rounding to the nearest ten.
  2. Estimate 92 – 41 by rounding to the nearest ten.

 

PERIOD 3 and 4:

PRESENTATION

TEACHER’S ACTIVITY

PUPIL’S ACTIVITY

STEP 1 – INTRODUCTION

Reviews estimation and introduces real-life problems involving estimation.

Pupils listen and ask questions.

STEP 2 – EXPLANATION

Explains how to estimate in real-life scenarios, such as shopping or measuring distance.

Pupils listen and discuss examples.

STEP 3 – DEMONSTRATION

Demonstrates solving real-life problems, like estimating the cost of groceries.

Pupils practice solving similar problems in pairs.

STEP 4 – NOTE TAKING

Pupils take notes on how to estimate in real-life situations.

Pupils write down the steps.

NOTE:

  • Estimation can help make quick decisions or solve everyday problems.

EVALUATION:

  1. Estimate the cost of buying 3 items priced at 249 Naira, 450 Naira, and 317 Naira by rounding the prices to the nearest hundred.
  2. Estimate the total time for a journey that takes 112 minutes and 89 minutes by rounding the times.

CLASSWORK:

  1. Estimate the total cost of items costing 128 Naira, 345 Naira, and 211 Naira.
  2. Estimate the time to complete a task if it takes 52 minutes and 71 minutes.

ASSIGNMENT:

  1. Estimate the total cost of buying 3 items priced at 145 Naira, 289 Naira, and 87 Naira.
  2. Estimate the total distance traveled if two distances are 214 km and 178 km.

PERIOD 5:

PRESENTATION

TEACHER’S ACTIVITY

PUPIL’S ACTIVITY

STEP 1 – INTRODUCTION

Recaps estimation techniques and introduces quantitative reasoning problems.

Pupils listen attentively.

STEP 2 – EXPLANATION

Solves a quantitative reasoning problem involving estimation.

Pupils solve similar problems with the teacher’s guidance.

STEP 3 – DEMONSTRATION

Demonstrates how to solve more complex estimation problems.

Pupils work on problems individually.

STEP 4 – NOTE TAKING

Pupils write down the steps for solving estimation problems.

Pupils note the methods for solving problems.

NOTE:

  • For quantitative reasoning, estimation helps solve problems quickly and accurately.

EVALUATION:

  1. Estimate the total cost of 2 items priced at 128 Naira and 376 Naira.
  2. Estimate the total time of a trip taking 120 minutes and 68 minutes.

CLASSWORK:

  1. Estimate the sum of 45 and 238 by rounding to the nearest ten.
  2. Estimate the sum of 95 and 74 by rounding to the nearest hundred.

ASSIGNMENT:

  1. Estimate the total cost of 3 items costing 315 Naira, 190 Naira, and 428 Naira.

Estimate the total time for a task taking 102 minutes and 56 minutes