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ESTIMATION AND ROONDING OF NUMBERS

Round off to nearest ten Round off to nearest hundred Round off to nearest thousand. ESTIMATION AND ROONDING OF NUMBERS. Created By Made Nuryadi. Round off to nearest Ten Pembulatan ke Puluhan terdekat. 82 is between 80 and 90 Is nearer to 80 than to 90

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ESTIMATION AND ROONDING OF NUMBERS

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  1. Round off to nearest ten Round off to nearest hundred Round off to nearest thousand ESTIMATION AND ROONDING OF NUMBERS Created By Made Nuryadi

  2. Round off to nearest TenPembulatankePuluhanterdekat 82 is between 80 and 90 Is nearer to 80 than to 90 So, 82 is 80 when rounded off to nearest ten

  3. The second example Panjang pita B 17 cm 17 terletakantara 10 dan 20 17 lebihdekatke 20 dibandingkanke 10 Sehingga 17 ≈ 20

  4. 78 ≈ 80 64 ≈ 60 Concept Concept: To round off a number to the nearest Ten, Untukmembulatkankepuluhanterdekat study the digit in the ones place: Pelajarinilaitempatsatuannya if it is 5 or greater than 5, round up Jikanilainyasamadengan 5 ataulebihbesardari 5, bulatkankeatas. if it is smaller than 5, round down Jikalebihkecildari 5 bulatkankebawah

  5. Practice !!! Let’s do it, you can?!! Round off each number to the nearest ten • 42 • 25 • 97 • 64 • 114 • 179 • 345

  6. Round off to nearest hundredPembulatankeratusanterdekat Concept: To round off a number to the nearest hundred, study the digit in the tens place: if it is 5 or greater than 5, round up if it is smaller than 5, round down

  7. There are 270 pupils in D-gym, round of the number of pupils in D-gymin to nearest hundreds 270 is between 200 and 300 It is nearer to 300 than to 200 270 is 300 when round off to the nearest hundred

  8. Example 2 Using the number line, round off each number to the nearest hundred 340 _____ 375 _____ 445 _____ 490 _____

  9. Practice 1Fill in the blanks • 24 195 is ____when round off to the nearest hundred • 65 250 is ____when round off to the nearest hundred • 68 890 is ____when round off to the nearest hundred • 35 450 is ____when round off to the nearest hundred

  10. Practice 2 Round off each number to the nearest hundred • 560 • 992 • 3560 • 9890 • 4770 Round off each number to the nearest hundred • 449 • 7940 • 61236 • 47960 • 89950

  11. Rounding off number to the nearest thousand Concept: To round off a number to the nearest thousand, study the digit in the hundreds place: if it is 5 or greater than 5, round up if it is smaller than 5, round down

  12. Example 1. The price of a math book is Rp 34.600,- when rounded off to nearest thousand rupiah. What could the price of the math book be? 34.600 is between 34.000 and 35.000 It is nearer to 35.000 than to 34.000 34.000 is 35.000 when round off to the nearest thousand

  13. Practice 1 Round off each number to the nearest thousand • 14 495 • 79.400 • 71.500 • 47.960 • 89.950 Round off each number to the nearest thousand • 56.678 • 45.555 • 68.780 • 123.567 • 245.650

  14. Problem solving • Find three numbers when rounded off to the nearest hundred is equal to if rounded off to the nearest thousand. • There were 3750 visitors at a science exhibition. Round off the number of visitors to nearest hundred and to nearest thousand.

  15. EstimationPerkiraan Round off each number to the nearest 100. then estimate the value off the following. • 1258 + 4108 • 3630-1215 • 2998 x 3

  16. Practice 1 Let’s find out in shaping math book activity part 1at page 11-12 LETS HAVE FUN IN MATH By Mr. Made

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