This is an English-only forum, so I would normally just delete a translation request, but it seems to me that even though 'delante de' means 'in front of', your zeros should come AFTER the number: We have to add zeros after the number until it has ten digits.
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Irland5Tenemos que añadir ceros delante del número hasta tener 10 dígitosI would not translate that literally. I would say
CalifJimWe have to add enough zeros in front of the given number to make a 10-digit number.Could you explain to me how adding zeros in front increases the number of digits? For instance, if we do that to the number 27, we get this: