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# 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.

### 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.

### 4. According to Journal of Applied Psychology

People usually arrange letters as well as numbers in the same order they read.

### 5. So many combinations

Companies found out that there were 9^9 possible combinations, which is equal to 387420489. That is huge!

### 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.