 The Russian plurals that may be seen on the actual currency are modified according to Russian grammar.Numbers ending in 1 (except for 11) are followed by nominative singular рубль "rubl′", копе́йка "kopéyka".Numbers ending in 2, 3 or 4 (except for 12–14) are followed by genitive singular рубля́ "rublyá", копе́йки "kopéyki".