Module in Math“ROUNDING OFF NUMBERS”

Submitted by:

Jayve Laurence C. AngelesIV – Diamond

Submitted to:

Mrs. Arlene G. Dialo

Great day! Hi Children, I’m Dexter…Can you help me to find my dearest sister Dee dee? She was disappeared after she tapped the button on my laboratory because we want to discover all about the world of Mathematics especially rounding off numbers.

Target Learner

So! Come on!!! Let’s find my dearest sister and explore more about rounding off numbers...Before it’s too late!!!!

1. Be sure that your hands are clean before it use.

2. Avoid tearing and folding it’s pages.

3. Do not write on it’s

Ooops! Before you’ve got started consider the following:

1. Be sure that your hands are clean before it use.

2. Avoid tearing and folding it’s pages.

3. Do not write on it’s

INTRODUCTION:

Hi Readers!!!

Help me to find my only sister Dee Dee. She was my big sister and also my biggest nuisance when it comes to the pursuit of scientific discovery. She also embraces everything whirly, twirly and girly in the world. Unfortunately, she was disappeared after she tapped the button on my laboratory because

OBJECTIVES

Hi Readers!!!

Help me to find my only sister Dee Dee. She was my big sister and also my biggest nuisance when it comes to the pursuit of scientific discovery. She also embraces everything whirly, twirly and girly in the world. Unfortunately, she was disappeared after she tapped the button on my laboratory because

After helping me in finding Dee dee, you will able to learn a lot in this module. These are the following:

Oh no! How can enter in this door and find my sister???Ahm! First we need to answer this question to open the door automatically…

Identify place values. Rounding off numbers

through thousands. Identify the number if this is

greater or lesser than 5.PRE – TEST:

Direction:Round off to the nearest one: 1.54 970= 2.1 879 450= 3.260 874=4.2 045=5.31 548=

Thank you friend if you were done in answering, you may check it to verify, if your answer was correct. I hope that you’ll get the perfect score and the door will automatically open for you!!!...

Key to Correction in Pre – Test:1. 54 9702. 18794503. 260 8704. 20405. 31 550

DISCUSSION

What is "Rounding"?Rounding means reducing the digits in a number while trying to keep its value similar.

Rules for Rounding Off Numbers:Rule 1: Determine what your rounding digit is and look at the digit to the right of it (highlighted digit).If the highlighted digit is 1, 2, 3, 4 simply drop all digits to the right of rounding digit.

Example:3.423 may be rounded off to 3.42 when rounded off to the nearest hundredths place.

3.423 may be rounded off to 3.4 when rounded off to the nearest tenths placeRule 2: Determine what your rounding digit is and look at the digit to the right of it (highlighted digit).If the highlighted digit is 5, 6, 7, 8, 9 add one to the rounding digit and drop all digits to the right of rounding digit.

Example:2.786 may be rounded off to 2.79 when rounded off to the nearest hundredths place.2.786 may be rounded off to 2.8 when rounded off to the nearest tenths place.2.786 may be rounded off to 3 when rounded off to the nearest units place.

2.856 may be rounded off to 2.9 when rounded off to the nearest tenths place.

Exception to Rule 2: When the first digit dropped is 5 and there are no digits following or the digits following are zeros, make the preceding digit even (i.e., round off to the nearest even digit).

Example:2.315 and 2.325 are both 2.32 when rounded off

to the nearest hundredths place.

SUMMARY:

In math, you can round up or round down. Rounding up happens when you have a value that is half or greater of the amount you are rounding. Let's say you want to round to the nearest ten. If you were given the value 26, you would round up because 6 is greater than half of ten (5). If you were given 25, you would also round up. Rounding down happens when the value is less than half. Using the same examples, if you were given the number 24 you would round down because the four is less than five. Even if you were given the wacky decimal 24.9999, you would still round down because 4.9999 is less than five. Here are some more examples:

Round 34 to the nearest 10 -- 30Round 678 to the nearest 10 -- 680 

Post-Test:

Direction:Round off to the nearest ten: 1.60 087= 2.40 833=

Before we exactly find my dearest sister, you need to answer some

questions for me….

3.90 665= 4.25 073= 5.36 487=

Key to Correction in Post – Test:1. 60 0902. 40 8303. 90 6704. 25 0705. 36 490

Thank you for helping me to answer this question. Ahm! In order for you to verify your answer if it is correct! You can find it on dexters laboratory where we can also find my dearest sister…So! Hurry bring Dee dee here!!!

Oooooooooh! Thanks a lot for helping me to find my sister Dee dee!! And exploring

more on mathematics world …I’ll hope we will meet together again….