Crossword Genius

Just fractions convert for them? (8)

Ross

I believe the answer is:

decimals

I'm a little stuck... Click here to teach me more about this clue!

'just fractions' is the definition.
'decimals' can be an answer for 'fractions' (decimal is a kind of fraction). I'm not certain of the 'just' bit.

I can't explain the rest of the clue.

Can you help me to learn more?

I've seen this clue in The Hindu.
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