# Online operations with numbers. 3 calculators available

- The calculators that are running the mathematical operations are free, all the calculations performed by the visitors are followed by step-by-step explanations.
- The detailed explanations that follow the calculations run by our visitors can be used also as an instrument of learning by examples, making the calculators that are listed below not just an instrument of getting the result / validating the result.
- The mathematical operations that can be run automatically are:
- 1. Adding and subtracting natural numbers: 2 available calculators.
- 2. Rounding off numbers: 1 available calculator.

## 1. Adding and subtracting natural numbers, 2 available calculators:

## 2. Rounding off numbers, 1 available calculator: