##### Step 1

Enter the first addend in the input box, which can be an integer, decimal, negative or scientific notation.

Welcome to the addition calculator, which is a commonly used for adding two numbers, both numbers are based on the decimal system. This calculator can not only solve integers addition, decimal addition, single, two-digit, three-digit or multi-digit addition, but also the addition of negative numbers, big numbers or scientific notation. Using this addition calculator, you can easily solve the problem of adding two numbers, look forward to your use.

Of course, if you want to understand the internal logic of addition, you can refer to our plus symbol article, which describes the entire specific calculation process.

As a reminder, if you want to calculate the addition of more than 2 numbers, you can use our other tool: Long Addition Calculator. If these numbers are consecutive integers, you can use sum of consecutive integers calculator, which is more convenient

Using this addition calculator is very simple, just 3 steps:

Enter the first addend in the input box, which can be an integer, decimal, negative or scientific notation.

Enter the second addend, similar to the first.

Click calculate button, the addition calculator will give the answer immediately.

Believe me, this tool is very easy to use, you will know that after a try. If you still find it difficult, please take a look at some examples below!

In this chapter, some examples are listed for your reference:

- Single digit addition
E.g. Sum of one digit number 5 and 8

Enter 5 in the first input box, enter 8 in the second input box, then click calculate button, the result 13 will appear immediately.

5 + 8 = 13

- 2 digit addition
E.g. Add the numbers 20 and 45

Enter first number 20, then enter second number 45. Click calculate button, the result 65 will show.

20 + 45 = 65

- 3 digit addition
E.g. Sum of 3 digit 120 and 660

First enter number 120, second enter number 660, then click calculate button. The result 780 will show up.

120 + 660 = 780

- More than 3 digit addition
E.g. Add the numbers 4 digits 2020 and 5 digits 15000

Enter first number 2020, then enter second number 15000. Click calculate button, the result 17020 will show.

2020 + 15000 = 17020

- Integers addition
E.g. Add the integers 21 and 30

Enter the integers 21 and 30 in the two input boxes, and click the calculate button.

21 + 30 = 51

- Decimals addition
E.g. Add the decimals numbers 2.5 and 12.83

Enter decimals number 2.5 in the first input box, enter decimals number 12.83 in the second input box, then click calculate button.

2.5 + 12.83 = 15.33

- Integer and decimals addition
E.g. Sum of integer 50 and decimals 6.5

Put the integer 50 in the first input box, and put the decimals 6.5 in the second input box, next click calculate button.

50 + 6.5 = 56.5

- Negative numbers addition
E.g. Sum of negative numbers -3 and -91

Enter the negative number -3 in the first input box, enter the negative number -91 in the second input box, then click calculate button, the result -94 will appear immediately.

-3 + -91 = -94

- Scientific notation addition
E.g. Sum of scientific notation numbers 1.5e+15 and 6.0e10

Enter the scientific notation number

**1.5e+15**in the first input box, enter the scientific notation number**6.0e10**in the second input box, then click calculate button.1.5e+15 + 6.0e10 = 1500060000000000

- Large numbers addition
E.g. Sum of large numbers 60000000000000000000000000 and 912222222222222222222

Enter the large notation number 60000000000000000000000000 in the first input box, enter the large number 912222222222222222222 in the second input box, then click calculate button.

60000000000000000000000000 + 912222222222222222222 = 6.0000912222222E+25

Well, with the above content, you should be able to easily use the addition calculator we provide. Here are some common problems:

- 1. Can integers be added with decimals?
It is perfectly possible, such as: 5 + 6.8 = 11.8.

- 2. Can negative numbers be added with positive numbers?
Yes, no problem, remember to enter the negative sign before the negative number.

- 3. What is the largest number?
You can enter more than 30 digits, this should be able to satisfy your use.

- 4. Can different digits be added together?
Of course you can, such as adding 2 digits to 4 digits: 15 + 2000 = 2015.

- 5. Can numbers in scientific notation be used?
Yes, just enter it directly. Eg. 1.5e+15 + 6.0e10 = 1500060000000000

- 6. Can the scientific notation number be added with ordinary number?
No problem at all, just like adding different digits. E.g. 1.5e+15 + 80 = 1500000000000080

- 7. Do I need to enter a plus sign for positive numbers?
No, you don’t need to enter the plus sign. Just enter the numbers directly.

- 8. Do I need to enter a negative sign for negative numbers?
Yes, you have to enter a negative sign so that our calculator will understand that it is a negative number.

The above is all about the addition calculator. If you have any questions, please leave a message to us. We will reply to you as soon as possible, thank you!