| 6 | BI-, BIN- | two, twice | bicycle, binoculars, biathlon, biceps, biconvex |
| 6 | CENT- | hundred | century, centennial, centenarian, cent |
| 6 | DECI(M), DECEM- | ten | decimal, December, decimate, decimal |
| 6 | DU- | two | duet, dualism, duologue, duplicitous, duumvirate |
| 6 | MILL- | thousand | millimeter, mill, million |
| 6 | OCT- | eight | octet, octameter, octogenarian |
| 6 | OCTAV- | eighth | octave, Octavian |
| 6 | PRIM- | first | primary, primitive, primipara, primogenitor |
| 6 | QUADR(U)- | four | quadrilateral, quadrangle, quadrumanous, quadruped |
| 6 | QUART- | fourth | quarter, quarterfinal, quarterly, quartet |
| 6 | QUINT- | fifth | quintuplet, quintet, quincunx |
| 6 | SEMI- | half | semiannual, semiautonomous, semicircle, semidiurnal, semifinal |
| 6 | SEPT(EM)- | seven | septet, September |
| 6 | SEXT- | six, sixth | sextet, sextuplets |
| 6 | TRI- | three | triple, tripartite, trivial, triangle, trilateral, trinity |
| 6 | UN- | one | uniform, unanimous, union, unilateral |