On the display panel, the space for each unit has seven LED segments. There is also a decimal point. Each LED segment gives off a glow when required. Depending upon the chip s instructions through the switch circuit, the different combinations of the segments light up for any decimal number from 0 to 9. Addition is done using the standard binary method.
Subtraction is done by reversing the whole method.
As mentioned earlier, multiplication and division are simply done by continued addition and subtraction respectively. For if we wanted to perform the task of multiplying 103 by 72, the calculator would add 103 seventy two times. Although it a time consuming and cumbersome operation for the human brain, the calculator performs it in a jiffy.