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Anyone good at maths around?

(5 Posts)
Notonaschoolnight 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

gamerwidow 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.

Lones80 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!

Notonaschoolnight 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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