3个一千是三千3个一千是三千30005个一千是五千5个一千是五千50009个一千是九千9个一千是九千900010000个十千百万20005000800010000三千九千...
认识整千数教学目标1.知识目标:经历数整千数的过程,体验数的进展;初步认识计数单位“万”,直观感受“10个一千是一万”的含义,了解万以...