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# Calculator help!! Watch

1. Hi I have the casio fx-85gt plus and was just doing a calculation to work out tension. The answer should have been 400√3 but my calculator gave the answer in decimal form. How can I get it into surds (the s=d button doesnt work)? Thank you!!
2. (Original post by natalie987)
Hi I have the casio fx-85gt plus and was just doing a calculation to work out tension. The answer should have been 400√3 but my calculator gave the answer in decimal form. How can I get it into surds (the s=d button doesnt work)? Thank you!!
I'm not entirely sure but you might want to check if your calculator is on the right set up.
Hit [shift] mode/setup , 1, 1 and try again this should set your calculator to output exact results, you can then use the S<=>D to convert to decimal.
3. (Original post by natalie987)
Hi I have the casio fx-85gt plus and was just doing a calculation to work out tension. The answer should have been 400√3 but my calculator gave the answer in decimal form. How can I get it into surds (the s=d button doesnt work)? Thank you!!
Your calculator won't recognise multiples of greater than . If you were expecting the answer to be a multiple of then you just need to divide by that number to obtain 400.

There is usually no problem with providing your answers as decimals to 3 s.f. in A level mechanics exams.

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