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This round off calculator is used to round large numbers in a short time to the required unit. For example, if you want to round a number from a hundred thousand to a tenth, you can use this calculator.
How to use the rounding calculator?
To use the number and decimal rounder:
 Enter the number.
 Choose the unit to which you want to round up the number.
 Click "Calculate".
Basic rules to round numbers
The process to round off numbers comprises several steps. Here are some rules that you need to use while rounding numbers.

The rule of less than 5 and 5 or greater than 5
The process of rounding uses “5” as the benchmark digit. If a number is less than 5, nothing is added to the number on its left and it is replaced by 0. Similarly, if the number is greater than 5, “1” is added to the number on the left.

Check the unit to which the rounding has to be done
If there is a number “4255”, and it has to be rounded off to the nearest 10, only the 5 on the extreme right would be dropped and 1 would be added to the 5 on its left.
For instance, if you consider the 4255, it would be 4260 when rounded off to the nearest tenth. Similarly, if it has to be rounded off to the nearest hundred, it would be 4300.
Rounding to the nearest tenth, hundred, and thousand place
Consider that we have the number 5776 and it has to be rounded off to the nearest tenth, hundred, and thousand (10, 100, 1000). Let us check the steps that are to be completed by the user.
Rounding to the nearest tenth place
 You need to start by rounding the number to the tenth.
 The number on the extreme right is 6. According to the regulations of rounding, it is greater than 5.
 The number on the left of 6 is 7 so 1 would be added to it.
 Hence, the number 5776 would become 5780.
Rounding to the nearest hundred place
 Once you have rounded off the number to the tenth, initiate the process to round it off to the nearest hundred.
 In the number, 5780, the required digit is 8. As this digit is greater than 5, 1 will be added to the number on its left.
 In this case, the number is 7 to the left of 7 so 1 would be added to it.
 Thus, when 5780 will be rounded off to the nearest hundred, it would be 5800.
Rounding to the nearest thousandth place
 Now, if you want to further round it off to the nearest thousand, the number will be 6000.
 It is because the digit 8 is greater than 5 so 1 would be added to the 5 of the number.
The above round off calculator can round the number to the nearest tenth, hundredth, or thousandth place in a fraction of a second
Example
Round 271,403 to the nearest hundred thousand.
Solution
Let's check the steps.
Step 1: First, get started rounding the number to the nearest tenth.
 In the given number, the most right digit is 3.
 According to the rounding number rules, 3 is less than 5, so the number to the left of 3 ie 0 will not change.
 Hence the number 271,403 would become 271,400
Step 2: After doing the step for the nearest tenth, initiate the rounding process for the nearest hundred.
 Again w.r.t the rules in the number 271,400, the required nearest tenth number is already 0, so the value will remain the same.
 Hence the number will be 271,400.
Step 3: Now round the number to the nearest thousand.
 In 271,400, 4 is on hundred places ie less than 5, by following rules there will be no change to the number on the left of 4 ie 1.
 Hence the number will become 271,000.
Step 4: Now further round off the number to the nearest tenth thousand.
 According to the current scenario, the number of thousand places is 1, which is less than 5.
 So the number at the left of 1 ie 7 will not change.
 Hence the number will now become 270,000.
Step 5: Now in the last round, the number to the nearest hundred thousand.
 In the current value of 270,000, the number at the ten thousandth place is 7 which is greater than 5 so add 1 to the left number of 7 ie 2.
 So it will become 3.
 Hence after the addition of 1, the number will be 300,000.
So, according to the above solution, 300,000 is the nearest hundred thousand of 271,403. You can also use the above rounding numbers calculator to solve these rounding processes in seconds.
Rounding in decimals and significant numbers
When you talk about rounding decimals, you need to understand the rules of significant figures. For instance, if the number 0.4556 has to be rounded off to 3 significant figures, the rounding would involve specific regulations.
Here are the rules which you need to use for significant figures.

All nonzero numbers are significant
This simply means that any number greater than zero would be counted as significant. If you have the number 0.4521, it would have four significant numbers.
If you have to round it off to 3 significant digits, the 1 on the extreme right will be dropped as it is less than 5. Hence, 0.4521 rounded off to three significant digits will be 0.452.

The zero between two nonzero numbers will be counted as significant
If you have the number 0.452, the number of significant numbers is 3. Similarly, the number 0.4025 has four significant digits.
Here, the zero between 4 and 2 is counted as a significant digit because it is present between two nonzero numbers.
Table of rounding to nearest hundred thousand
Numbers  Rounded to the nearest hundred thousand 
137 465  100000 
452 437  500000 
378 950  400000 
651 970  700000 
271 403  300000 
281 673  300000 
221,333  200000 
124 278  100000 
845 001  800000 
36 815  400000 
233,500  200000 
Table of rounding to nearest ten thousand
Numbers  Rounded to the nearest ten thousand 
562 022  560000 
7 425 963  7430000 
651 970  650000 
710 565  710000 
15 203  20000 
88 999  90000 
73 562  70000 
651 970  650000 
164 215  160000 

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Nice, Very good and simple round calculator. Thanks for developing it.