# Talk

## Anyone good at maths around?

(5 Posts)
Sun 14-Dec-14 17:41:52

It says to use a calculator I have no idea how to even use the calculator to do the x little 3 bit!! Can anyone help my daughter out

Pipbin Sun 14-Dec-14 17:46:51

Either use a scientific calculator or do x cubed. www.mathsisfun.com/numbers/cube-root.html

Sun 14-Dec-14 17:47:42

It's a cubed number eg 2 little 3 would be 2x2x2
4 little 3 would be 4x4x4 etc.

Sun 14-Dec-14 17:52:38

Start by doing the calculation on the LHS using x=4.5. If the answer is less than 80 you know x>4.5. If it's greater than 80 then x<4.5.

You can then try different values of x to narrow down the range of values for x to two values 1dp apart (eg x is between 4.2 and 4.3).

Once you have calculated this use a value of x half way between these values (in my example, 4.25) to determine if x is bigger or smaller than the midway point. This will help you determine the answer to 1dp (so if x is between 4.2 and 4.25 the answer is 4.2, but if it's between 4.25 and 4.3 the answer is 4.3).

Sorry for my clumsy explanation, hope this makes sense!

Sun 14-Dec-14 18:45:08

Got you thank you all very much I shall have another go now and will be writing a note to say I did all the work not dd!

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