Pansy Puff wrote:Deebank wrote:22/7 is pi!!!!!!

No it isn't!!

A number that

cannot be expressed as a fraction is called an

irrational number. Pi is one of these numbers.

An irrational number is a number that does not recur in a decimal pattern – like pi where the decimal places go on forever in no set order or pattern

To approximate we use values of pi which include 22/7, 3.1, 3.14, 3.1412 depending on the level of accuracy required.

So an approximate value of pi 22/7, as stated by your teacher, is correct

It follows that a number that

can be expressed as a fraction recurs in a decimal pattern and is called a

rational number

Eg 0.333..= 1/3

0.121212…= 12/99

0.173173173... = 173/999

0.166666666… = 1/6

This includes terminating decimals that ‘stop’

Eg 0.1 = 0.10000000… = 1/10

For the record an integer (whole number including zero) is a rational number because they can also be expressed as a fraction

Eg 6 = 6/1

5 = 30/6

0 = 0/9

.