Question

how do you know if a number is rational or irrational

Answer 1

if a number can be rewritten as a fraction then it is rational. so like 0.5 is rational because it can be rewritten as 1/2. Pi cannot rewritten (so it is irrational) as it is infinite long.

Answer 2

thxs

Answer 3

if it has dots on the side then is it rationaal or irrational example 2.887766...

Answer 4

pls help

Answer 5

the dots means it keeps going, and any decimal that keeps going and doesn't repeat itself is irrational.

Answer 6

so it's irrational.

Answer 7

ok thanks

Answer 8

it always gonna be irrational?

Answer 9

or could it be rational like ex 0.99999...

Answer 10

0.99999... repeats, so it would be rational.

Answer 11

ok thanks

Answer 12

and

Answer 13

if it is irrational it has a qwith a bar on top and if its rational it just has a q?

Answer 14

um...I don't know what you mean?

Answer 15

like there is Q with a bar on top if it irrational , that's what i learnd but maybe it rational im not sure

Answer 16

I've never heard anything about a q...but the bar on top makes me think of numbers that repeat and keep going, such as 0.999999...instead of the "..." you could have a bar above the 9's.

Answer 17

irrational have decimals that have no pattern to them.
you get them from taking square roots, cubic roots, etc. or pi or e (special numbers)