Basic Math: Rounding Off, Adding and Subtracting Numbers, Online Calculators

Three online calculators available: [+] Adding numbers [+] Subtracting numbers [+] Rounding off numbers

The calculators that are running these mathematical operations are free and all the calculations performed by the visitors are listed, followed by step-by-step explanations.
These detailed explanations that follow all the calculations run by our visitors can be used as an instrument of learning by seeing, making the calculators that are listed below not just an instrument of getting the result, or validating a result, but a valuable resource to teach yourself some basic math skills.

1.1. Adding multiple digit numbers, online calculator
Calculate the sum and learn how to add multiple digit numbers using the column adding method, from right to left (carrying over if the case).

How to add numbers: 196 + 219?	May 15 15:32 UTC (GMT)
How to add numbers: 732 + 268?	May 14 21:33 UTC (GMT)
How to add numbers: 99 + 14 + 44?	May 14 18:48 UTC (GMT)
How to add numbers: 183 + 175?	May 14 18:28 UTC (GMT)
How to add numbers: 558 + 639?	May 14 18:09 UTC (GMT)
All the operations with the numbers added by users...

How to add two numbers? 1. Stack the numbers on top of each other. 2. Add their digits column by column starting from the column to the right. If the result of a two digit addition is more than 9, carry over the excess bit of 1 to the next column to the left.
1.2. Subtracting multi digit whole numbers, online calculator
Calculate the difference and learn how to subtract multiple digit numbers using the column subtracting method, from right to left (borrowing from the higher place value column if the case).

How to subtract numbers: 476 - 422 - 532 + 428 + 979?	Apr 24 18:28 UTC (GMT)
How to subtract numbers: 476 - 422 - 532 + 428 + 979 + 39?	Apr 24 18:28 UTC (GMT)
How to subtract numbers: 476 - 422 - 532 + 428 + 979?	Apr 24 18:28 UTC (GMT)
How to subtract numbers: 476 - 422 - 532 + 428 + 979?	Apr 20 10:47 UTC (GMT)
How to subtract numbers: 476 - 422 - 532 + 428 + 979?	Apr 20 10:47 UTC (GMT)
All the operations with the numbers subtracted by users...

How to subtract two numbers? 1. Stack the numbers on top of each other. 2. Subtract column by column starting from the column to the right. If the second digit is larger than the first borrow 10 from the next column to the left.

2.1. Rounding off numbers to whole or decimal places, online calculator
Rounding off positive and negative numbers to whole or decimal places: half up, half down, half away from zero, half towards zero, half to even, half to odd, to ceiling, to floor.

Round off 0.0202020270452 to the nearest tenth (1 decimal place)	May 15 20:24 UTC (GMT)
Round off 179.11111118774715 to the nearest tenth (1 decimal place)	May 15 20:24 UTC (GMT)
Round off 1.06798383997986 to the nearest tenth (1 decimal place)	May 15 20:24 UTC (GMT)
Round off 13,802 to the nearest ten thousand (5 whole places)	May 15 20:24 UTC (GMT)
Round off 5,085 to the nearest thousand (4 whole places)	May 15 20:24 UTC (GMT)
» NEW: Numbers rounded to whole and decimal places. Calculations performed by visitors
» OLD: All the operations with the numbers rounded off by users - Dataset no longer updated...

Rounding a number means replacing it by another value that is a simpler, shorter approximation, while keeping its value close to the initial one. The rounded number will be less accurate, but easier to work with.