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Let's say the sentence is:

I need a bigger one.

My attempt is:

Necesito una más grande.

This obviously doesn't sound right to me. So, I would like to know how a native speaker would translate such sentences with an adjective (in comparative form, such as bigger, smaller, thinner, higher, etc.) with the word "one" after it.

Similarly, what if I had to say another one instead of bigger one here? Will it be una otra?

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up vote 7 down vote accepted
Necesito uno (una) más grande

Both are correct

No cabe en la bolsa, necesito una más grande
El costal está lleno, necesito uno más grande

Another one

Otro - otra
Ya no tengo pintura, necesito otro litro
Yo no tengo pintura, necesito otra lata
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"necesito otra lata"...This is good if I wanted to say, "I need another can". But what if I don't want to explicitly mention the can and just say, "another one" instead? – TheLearner May 29 '14 at 13:37
Use necesito otra, lata is feminine, necesito otro (coche) car is masculine. – Nicoli May 29 '14 at 13:41
If you've already said Necesito once already, you can get away with just saying Otra... or Otro... or even.. uno(a) más – dockeryZ May 29 '14 at 20:20

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