 
| 23.5.3 By threes, in threes, three of | 
| en ... | by ... | |
| Vinieron de tres en tres. | They came by threes. |   | 
| Lo comprarón por centenares. | They bought it by hundreds. |   | 
| en ... | in ... | |
| Estaban empaquetados en paquetes de diez piezas. | They were packed in tens. |   | 
| Siempre los coleccionó de tres en tres. | He collected everything in threes. |   | 
| of ... | ||
| Eramos tres. | There were three of us. |   | 
| Eran diez. | There were ten of them. |   | 
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