gm. general math – Calculation of a period of sine wave and frequency – I have an answer to a question that is verified but seems incorrect

It is in two parts.

First I need to get the period of a wave with a frequency of 475Hz and then round it to 3 significant figures

It occurred to me:

1/475 * 103 = 2.11

Then, I need to reduce the value of time by a factor of 5 and then get the frequency.

I finished with

5 / 2.11 * 10 ^ 3 = 2.37KHz

Now, what's wrong with me is that it should be "2.11 / 5", but it's the other way around.

This gives me a different answer.
2.11 / 5 * 10 ^ 3 = 0.42KHz

The problem now is that, according to an online calculator, the first response of 2.37KHz is correct and 0.42KHz is incorrect.

Please help? Is the division supposed to be the other way around? Is this just a feature of this particular brand of math?

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Oracle: What question could you return to customers, phones and contract time, that is, according to the following example?

TO ()
SELECT C.NM_CLIE, T.NR_TELE, ROUND ((SYSDATE – T.DT_CADASTRO)) || & # 39; YEARS & # 39 ;. Like the time

CUSTOMERS C,

 TELEFONES T 

WHERE C.ID_CLIE = T.ID_CLIE

B ()

SELECT C.NM_CLIE, T.NR_TELE, ROUND ((SYSDATE – T.DT_CADASTRO) / 365.25) || & # 39; YEARS & # 39 ;. Like the time

CUSTOMERS C,

 TELEFONES T 

WHERE C.ID_CLIE = T.ID_CLIE

C ()

SELECT C.NM_CLIE, T.NR_TELE, ROUND ((SYSDATE – T.DT_CADASTRO) * 365.25) || & # 39; YEARS & # 39 ;. Like the time

CUSTOMERS C,

 TELEFONES T 

WHERE C.ID_CLIE = T.ID_CLIE

D () SELECT C.NM_CLIE, T.NR_TELE, ROUND ((SYSDATE / T.DT_CADASTRO) * 365.25) || & # 39; YEARS & # 39 ;. Like the time

CUSTOMERS C,

 TELEFONES T 

WHERE C.ID_CLIE = T.ID_CLIE

AND () SELECT C.NM_CLIE, T.NR_TELE, ROUND ((SYSDATE + T.DT_CADASTRO) * 365.25) || & # 39; YEARS & # 39 ;. Like the time

CUSTOMERS C,

 TELEFONES T 

WHERE C.ID_CLIE = T.ID_CLIE

F () None of the above.

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