The multiplicative case (abbreviated MLT or MLTP) is a grammatical case used for marking a number of something ("three times").
The case is found in the Hungarian language, for example nyolc (eight), nyolcszor (eight times).
The case appears also in Finnish as an adverbial (adverb-forming) case. Used with a cardinal number it denotes the number of actions; for example, viisi (five) -> viidesti (five times). Used with adjectives it refers to the mean of the action, corresponding the English suffix -ly: kaunis (beautiful) -> kauniisti (beautifully). It is also used with a small number of nouns: leikki (play) -> leikisti (just kidding, not really). In addition, it acts as an intensifier when used with a swearword: piru -> pirusti.
References
Multiplicative case Wikipedia(Text) CC BY-SA