Ever Wondered Why Numbers On Phones And Calculators Are Opposite?

If you have noticed the keypad on your phones and calculators carefully, you will notice that while phones have 1-2-3 in the top row, calculators have 7-8-9. What is the reason behind this? Is there any particular advantage? Or any psychological reason? Read on to check the reason.

1. In the early 1900s, rotary telephones came to the USA.

The phones had numbers 1 to 9 sequentially, while 0 was placed after 9.[adinserter block=”16″]

2. Keypad phones came in the 60s.

[adinserter block=”16″]

3. Push-button phones were still not available to the public.

During that time, several studies were done to find out which number layout minimises chances of error while dialing. [adinserter block=”16″]

4. According to Journal of Applied Psychology

People usually arrange letters as well as numbers in the same order they read.
[adinserter block=”16″]

5. So many combinations

Companies found out that there were 9^9 possible combinations, which is equal to 387420489. That is huge![adinserter block=”16″][adinserter name=”5th page”][adinserter block=”16″]

6. But logical ones are less

Although the number of combinations is mind bogglingly huge, that doesn’t mean you will dial all of them, so they tested only the logical ones.
[adinserter block=”16″][adinserter name=”6th and multiple”]

7. Bell Labs conducted a study in 1960s

They found out that most people preferred a horizontal placement of two rows of buttons. This design minimized errors and was also the fastest.
[adinserter block=”16″]

8. Texas Instruments created its first handheld calculator prototype in 1967.

The top row had the numbers 7-8-9. They followed this method since earlier desktop adding machines followed the same pattern.[adinserter block=”16″]

9. At present, calculators and phones have two separate keyboard layouts and people have become used to them.

[adinserter block=”16″][adinserter name=”last page”]