quizA quiz on the history of arithmetic (5-6 class) Psheno Elena Viktorovna teacher of Mathematics MKOU School No. 2, Irgakly, ... 0 3k 0 July 24, 2013
quizAn arithmetic quiz Seven light bulbs were burning. Two went out. How much is left? Seven burned... 0 2k 0 October 10, 2009