Scientific calculators also have basic usage. Like ordinary calculators, you can calculate addition, subtraction, multiplication and division. On the right side of the scientific calculator are buttons for some logical operations, such as NAND or AND remainder operations. Take the remainder operation as an example. Just like the common operation usage, press a number, such as 8, then press the operator' remainder', and finally press the number 3 and press the = sign to get the result 2. The remainder of eight divided by three is two.

Below the scientific calculator are some complex mathematical operations, such as finding the value of sin, cos or square. Take the square value as an example. Press the number 3 first, and then press the square key, and you will get the result of 9.

The above calculation is based on decimal system. We can also calculate other decimals, such as octal. Octal is just a number from 0 to 7, because every 8 is a one.

7+4= 13 in octal.