Numpty dad needs maths help

Work out [tiny 3][square route]125

Any help appreciated with the method to solve this please.

5

Cube root

What do you multiply by itself and itself again to give 125?

You can really only get there by guess work and averaging your guesses.

Cheers druidh, can see it now.

Or a calculator…

So it 3.34_ _ ??

Please tell me thats not a 12 year old’s homework!

calculator? noob!
take the log of 125 (you have got a log book, haven’t you?)
divide by three
look up the antilog
job done

tbh I don’t know how it’s currently taught without log tables, but looking at KS3 sites it looks like trial and error seems popular.

So it 3.34_ _ ??

No, it’s 5.

Doh! you work it back, not forwards :oops:

I was trying to get 125 by multiplying ?x?x? =125, hence the 3.34xx

I was trying to get 125 by multiplying ?x?x? =125, hence the 3.34xx

Now I’m really confused. How did you get 3.34?

3.34 x 3.34 x 3.34 = about 37

Oh hang on.. 3.34 x 3.34 = 11.2, 11.2 x 11.2 = 125.

So 3.34 is the 4th root whatever that is called.