ESTIMATION AND ROONDING OF NUMBERS Round off to nearest ten Round off to nearest hundred Round off to nearest thousand 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 So, 82 is 80 when rounded off to nearest ten

The second example Panjang pita B 17 cm 17 terletak antara 10 dan 20 17 lebih dekat ke 20 dibandingkan ke 10 Sehingga 17 ≈ 20

Concept 78 ≈ 80 64 ≈ 60 Concept: To round off a number to the nearest Ten, Untuk membulatkan ke puluhan terdekat study the digit in the ones place: Pelajari nilai tempat satuannya if it is 5 or greater than 5, round up Jika nilainya sama dengan 5 atau lebih besar dari 5, bulatkan keatas. if it is smaller than 5, round down Jika lebih kecil dari 5 bulatkan kebawah

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

Round off to nearest hundred Pembulatan ke ratusan terdekat 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

There are 270 pupils in D-gym, round of the number of pupils in D-gym in 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

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

Practice 1 Fill 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

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

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

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

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

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.

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

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