3. lesson 2 comparing, ordering, and rounding-off w ns

PowerPoint Presentation

Comparing and Ordering Whole Numbers

Quote-plete Me!

COMPARING WHOLE NUMBERS

Comparison Symbols


Tips:The GREATER the number of DIGITS, the GREATER the NUMBER.Ex. 5,284____324


Tips:2) If the given numbers have the same number of digits, compare each digit from LEFT to RIGHT. Ex. 32,452,192____ 32,458,192


Tips:3) Familiarize yourselves with various forms of writing numbers.Ex. Two hundred fifty-two ____200+50+2


More examples:

45,092_____445,002


More examples:

3,895,124_____3,895,134


More examples:

234 million, 287 thousand, 500_____234, 287,005


More examples:

Four thousand, twenty-three_____4,000+20+3


More examples:

293,002,123 _____293 million, 2 thousand, 123

Quote-plete Me!


ONLINE HOMEWORK

Professor Oaks Dilemma

Good day, Grade 4! Im Professor Oak from Pallet town. Im a Pokmon professor and researcher. I encountered countless number of Pokmon already. However, Im afraid that I can remember them all with my age. So, I recorded their data in a device called Pokdex


However, I think theres quite a problem I accidentally mixed-up some of Pokmon data. Some ORDER got mixed-up. Maybe you can help me fixing it by ORDERING the Pokmon in ASCENDING ORDER, by their number


By the way, do you know how to ORDER NUMBERS?

Worry no more! Ill explain that to you. So better pay attention, ok?!

ORDERING WHOLE NUMBERS

2 Orders:

Ascending or Increasing Order

Descending or Decreasing Order


ASCENDING or INCREASING ORDER

- The numbers are arranged from LOWEST to HIGHEST


Example: The monthly budget (in pesos) of Dela Cruz Family in 4 months are: 34,283 pesos, 29,304 pesos, 32,829 pesos, and 30,273 pesos. Arrange their monthly budget in ASCENDING ORDER


DESCENDING or DECREASING ORDER

- The numbers are arranged from HIGHEST to LOWEST


Example: [insert students name]s weekly baon for 4 weeks are 827, 847, 839, and 902 pesos. Arrange his/her weekly baon in DESCENDING ORDER


Are we clear about ORDERING WHOLE NUMBERS?

Can you now lend me a hand in fixing my Pokdex?

Ok, we need to arrange them in ASCENDING ORDER

Ok, we need to arrange them in DESCENDING ORDER


Thank you so much for helping me fix my Pokdex! See you soon!


Dont forget to ANSWER Primary Mathematics 4 pages 14 16.Thats your SEATWORK for today.

Half Full? Or Half Empty?

Look at the water bottle in front with some water in it. Tell whether the water bottle is half full or half empty. Share your thoughts on class.

ROUNDING-OFF WHOLE NUMBERS

Means we give an estimated value of the numberAlso called ESTIMATION or APPROXIMATION


Rounding Poem

Find your numberLook right next doorThe crystal ball will tell you more


5 or more,Let it score!4 or less,Let it rest

The crystal ball is the heroIt turns all the rest to zeroes



Examples: Round-off the following:

1) 3,683 (to the nearest THOUSANDS)2) 499,093 (to the nearest TEN THOUSANDS)3) 32,723,002 (to the nearest TEN MILLIONS)


Examples:

4) The average calorie intake per day for men is 2,640, while for women is 1,785. Round-off those calories in the nearest HUNDREDS.


Examples:

5) According to Guiness World Records, the most tweeted hashtag in 24 hours is #AlDubEBTamangPanahon with 40,706,392 tweets. Round-off the number in the nearest MILLIONS.


Challenge Problems:

1) *Open your books on PAGE 20*


Challenge Problems:

2) What is the LEAST possible number, when rounded-off to the nearest HUNDRED THOUSANDS, the number is 800,000?How about the GREATEST?


Challenge Problems:

3) Arrange the digits 1,2,3,4,5 (w/ no repetitions) to form the GREATEST possible number that when rounded-off to the nearest THOUSANDS the number is 31,000.


Pair Seatwork

Primary Mathematics 4 pages 21 23


Homework

Primary Mathematics 4 page 24 (Mind Workout)

3. lesson 2 comparing, ordering, and rounding-off w ns

Education

Transcript of 3. lesson 2 comparing, ordering, and rounding-off w ns