Женя Кац. "Пирог с математикой" (http://www.amazon.com/Cake-math-Russian-Edition-Eugenia/dp/5443900218/ref=sr_sp-btf_title_1_12?ie=UTF8&qid=1404917866&sr=8-12&keywords=jane+kats), и ее же рабочие тетради Мышематика (http://www.amazon.com/s/ref=nb_sb_ss_i_0_7?url=search-alias%3Daps&field-keywords=jane%20kats&sprefix=jane+ka%2Caps%2C207&rh=i%3Aaps%2Ck%3Ajane%20kats).
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"Пирог с математикой" (http://www.amazon.com/Cake-math-Russian-Edition-Eugenia/dp/5443900218/ref=sr_sp-btf_title_1_12?ie=UTF8&qid=1404917866&sr=8-12&keywords=jane+kats),
и ее же рабочие тетради Мышематика (http://www.amazon.com/s/ref=nb_sb_ss_i_0_7?url=search-alias%3Daps&field-keywords=jane%20kats&sprefix=jane+ka%2Caps%2C207&rh=i%3Aaps%2Ck%3Ajane%20kats).