| Answer | Crossword Clue |
|---|---|
| OCTO | Bi-, quadrupled |
| OCTA | Bi- quadrupled |
| MLII | CCLXIII quadrupled |
| OCTET | Duo quadrupled |
| OCTO | Duo quadrupled |
| LII | XIII quadrupled |
| CXVI | XXIX quadrupled |
| MCLX | CCXC quadrupled |
| CLVI | XXXIX quadrupled |
| CMIV | CCXXVI quadrupled |
| CCIV | LI quadrupled |
| MIV | CCLI quadrupled |
| DCIV | CLI quadrupled |
| MCC | XXX quadrupled |
| CIV | XXVI quadrupled |
| LVI | XIV quadrupled |
| MLII | CCCLXIII quadrupled |
| ITSAMADWORLD | Partly quadrupled, a 1963 comedy |
| AMAZON | Internet company whose stock price quadrupled in its first three months |
