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Lesson 56:

Estimating Elapsed Time

Milaluna v. barrientos

c.p. sta. teresa elem. School

Taguig city

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Value focus : industry

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Objective:

Estimate the duration of time

in minutes.

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Prerequisite concepts

and skills

*Rounding whole numbers to the specified

place value.

*Estimating the sum and difference of

whole numbers.

*Finding elapsed time in minutes and

seconds.

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Instructional procedure:

A . Preliminary Activities

1. Drill

A. Round each number to the

specified place value.

A. 45 980 (thousands)

B. 99 827 (ten thousands)

C. 567 (tens)

D. 73 495 ( hundreds)

E. 84 805 (ones)

46,000

100,000

570

73,500

84,805

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B. Arrange the digits to form four-digit

numbers to answer the questions

below.

[teamwork]

A. The highest number that rounds to

4000 is ___________.

B. The highest number that rounds to

9000 is ___________.

C. A number that rounds to 1000 is ____.

D. A number that rounds to 6000 is ____.

E. The lowest number that rounds to

5000 is _____.

4,5,1,8

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2.Review

A . Estimating the sum.

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B . Estimating the Difference

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3.Motivation

Look at the girl . Does she have any

companion in cleaning . How about you

do you also work without being told or

when no one is watching?

Relate the value of industry.

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B . Developmental activities

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3.Processing the Activity

Is there a difference between the exact elapsed time and estimated elapsed time? Is the estimated time

reasonable? How did you estimate time in minutes ?

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DISCUSS

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Work in pair

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Do Get Moving on page 178

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Do Keep Moving on page 179

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4.Generalization

How do we estimate the

elapsed time in minutes?

To estimate the elapsed time, round the

Minutes in the time ended and time started

To tens. Then, find the difference

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5.Applying to New and Other

Situations