क्रीतवत् परिमाणात्

After a word denoting 'a measure' the affix expressing 'its product or part' is the same as the affix having the sense of 'purchased'.
The affixes taught in 5.1.18 &c are the affixes that have the force of क्रीत 5.1.37. These affixes come also after words denoting measure 5.1.19. The same affixes are employed to denote विकार, after words denoting परिमाण ॥ This debars अण् &c. Thus निष्केन क्रीतम् = नैष्किकम् 5.1.20; It will denote vikara also, निष्कस्य विकारः = नैष्किकः formed by ठक् 5.1.20. As शतेनक्रीतं = शत्यं or शतिकम् 5.1.21, so शतस्य विकारः = शत्यः or शतिकः by ठन् and यत् 5.1.21, सहस्रेणक्रीतं = साहस्रम् 5.1.27 so सहस्रस्य विकारः = साहस्रः (V. I.27 by अण्) ॥

The word वत् in क्रीतवत् indicates that the similarity is complete throughout. Thus Sutra 5.1.28 also applies, by which the affix is elided. As द्विसहस्रः or द्विसाहस्रः 5.1.29, द्विनिष्कः or द्विनैष्किकः ॥ The word परिमाण in this sutra includes संख्या 'the, numerals' also; while the technical word परिमाण does not include sankhya. See 4.1.22 and 5.1.19 &c. The similarity extends even to the elision of affix 5.1.28 as, द्विसहस्रः, द्विसाहस्रः &c.