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Rounding Off Decimals.

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Presentation on theme: "Rounding Off Decimals."— Presentation transcript:

1 Rounding Off Decimals

2 Round off 37 to the nearest ten
Rounding Off Decimals Round off 37 to the nearest ten 10 20 30 40 50 60 90 80 70 100 37 is between 30 and 40

3 37 40 Round off 37 to the nearest ten 37 is nearer to 40 than to 30
Rounding Off Decimals Round off 37 to the nearest ten 37 31 32 33 34 35 36 37 38 39 30 40 37 is nearer to 40 than to 30 37 is when rounded off to the nearest ten 40

4 Round off 750 to the nearest hundred
Rounding Off Decimals Round off 750 to the nearest hundred 500 600 700 800 900 1000 750 is between 700 and 800

5 halfway Round off 750 to the nearest hundred 800
Rounding Off Decimals Round off 750 to the nearest hundred 700 720 740 750 760 780 800 halfway 750 is halfway between 700 and 800 750 is when rounded off to the nearest hundred 800

6 Rounding Off Decimals Round off 1.4 to the nearest whole number 1 2 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 1.4 is nearer to 1 than to 2 1 1.4 is when rounded off to the nearest whole number

7 Rounding Off Decimals Round off 1.7 to the nearest whole number 1 2 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 1.7 is nearer to 2 than to 1 2 1.7 is when rounded off to the nearest whole number

8 Rounding Off Decimals Round off to the nearest whole number 1 2 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 1.9 1.764 1.764 is nearer to 2 than to 1 2 1.764 is when rounded off to the nearest whole number

9 Where are the tenths? 4.6 4.56 is nearer to 4.6 than to 4.5
Rounding Off Decimals Round off 4.56 to the nearest tenth 4.5 4.51 4.52 4.53 4.54 4.55 4.56 4.57 4.58 4.6 4.59 Where are the tenths? 4.56 is nearer to 4.6 than to 4.5 4.56 is when rounded off to the nearest tenth 4.6

10 Rounding Off Decimals Round off 4.52 to the nearest tenth 4.5 4.6 4.51 4.52 4.53 4.54 4.55 4.56 4.57 4.58 4.59 4.52 is nearer to 4.5 than to 4.6 4.52 is when rounded off to the nearest tenth 4.5

11 Rounding Off Decimals Round off 4.55 to the nearest tenth 4.5 4.51 4.52 4.53 4.54 4.55 4.56 4.57 4.58 4.6 4.59 Rounding off to the nearest tenth is the same as rounding off to 1 decimal place. 4.55 is halfway between 4.5 and 4.6 4.55 is when rounded off to the nearest tenth 4.6

12 Rounding Off Decimals If the digit is equal to 5 or more than 5, add 1 to the digit in the tenths place. 4.56  4.6 4.72  4.7 If the digit is less than 5, retain the digit in the tenths place. 4.85  4.9 When rounding off to 1 decimal place, consider the digit in the hundredths place only.

13 Where are the hundredths?
Rounding Off Decimals Round off to the nearest hundredth 4.51 4.512 4.514 4.516 4.518 4.52 4.511 4.513 4.515 4.517 4.519 Where are the hundredths? 4.518 is nearer to 4.52 than to 4.51 4.518 is when rounded off to the nearest hundredth 4.52

14 Rounding Off Decimals Round off to the nearest hundredth 4.51 4.512 4.514 4.516 4.518 4.52 4.511 4.513 4.515 4.517 4.519 4.514 is nearer to 4.51 than to 4.52 4.514 is when rounded off to the nearest hundredth 4.51

15 4.52 4.515 is when rounded off to the nearest hundredth
Rounding Off Decimals Round off to the nearest hundredth 4.51 4.512 4.514 4.516 4.518 4.52 4.511 4.513 4.515 4.517 4.519 Rounding off to the nearest hundredth is the same as rounding off to 2 decimal places. 4.515 is halfway between 4.51 and 4.52 4.515 is when rounded off to the nearest hundredth 4.52

16 Rounding Off Decimals If the digit is equal to 5 or more than 5, add 1 to the digit in the hundredths place. 4.528  4.53 4.564  4.56 If the digit is less than 5, retain the digit in the hundredths place. 4.515  4.52 When rounding to 2 decimal places, consider the digit in the thousandths place only.

17 Rounding Off Decimals

18 5 7 8 4.8 liter is ______ liter when rounded off to the nearest liter.
Rounding Off Decimals 5 4.8 liter is ______ liter when rounded off to the nearest liter. 7 7.259 kg is ______ kg when rounded off to the nearest kilogram. 8 8.49 m is ______ m when rounded off to the nearest meter.


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