算術 さんじゅつけた おくりじゃなかったです
sanjutsuketaokurijanakattadesu

Noun
Desu Copula

The polite, past negative form of 算術けた送り

1. Wasn't doing mental arithmetic.; Didn't calculate in one's head.

Past/Perfective
Negative
Polite
Casual Register
Computing