《蚂蚁做操》教学课件.ppt

,蚂蚁做操,荷花小学 王世玉,一共有多少只小蚂蚁？,12121212,一共有多少只小蚂蚁？,124,124,4个6,4个6,64=24,242=48,124,2个12,2个12,122=24,242=48,124,10个4,2个4,104=40,24=8,408=48,1 2 4,十位,个位,8,24,124,4 0,4 8,24,1 2 4,8,4,乘数,乘数,积,2133=,请你试着算一算。,2003=600,103=30,33=9,600309=639,639,2133=,请你试着算一算。,2 1 3 3,639,9,9个一,3,3个十,6,6个百,8,2,3,9,6,3,9,2,4,8,611=,1119=,1 1 6,6 6,66,1 1 1 9,9 9 9,999,