Crossword Genius

Figures in decimalisation (4)

Ross

I believe the answer is:

tens

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'figures' is the definition.
(ten is a number)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for tens that I've seen before include "At least 20" , "Half-scores" , "X, X, X, ..." , "Cardinal numbers" .)

I've seen this clue in the Evening Standard.
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