填一填.
70+70+70+70=________×________=________
51×4=________×________+________×________=________+________=________
700+700+700=________×________=________
3×400=________+________+________=________
________×________=90+90+90+90=________.
70 4 280 50 4 1 4 200 4 204 700 3 2100 400 400 400 1200 90 4 360
分析:根據(jù)整數(shù)加法的意義和乘法的意義進行解答即可.
解答:70+70+70+70=70×4=280
51×4=50×4+1×4=200+4=204
700+700+700=700×3=2100
3×400=400+400+400=1200
90×4=90+90+90+90=360.
故答案為:70,4=,280,50×,4,1,4,200,4=,204,700×3,2100,400,400,400,1200,90,4,360.
點評:此題考查了整數(shù)加法的意義和乘法的意義及應(yīng)用.