11-20各数的认识-PPT课件.ppt

1120各数的认识,10个一,是,1个十。,10个一,是,1个十,个位,十位,我的名字叫（），,计数器,我从右边起第一位是（），,个位,第二位是（）。,十位,我个位上拨1个珠子，表示（）个（），拨2个珠子，表示（）个（），拨3个、4个、5个呢？请你拨一拨，说一说。个位上拨10个珠子，表示（）个（）呢？,个位,十位,1,一,2,一,个位,十位,10个一,是,1个十,10个一,是,1个十。,1个十里面有,10个一。,第二课时,11颗,请你摆一摆、拨一拨，表示11。,11,好,11,13,18,好,2个十,20,是,用你喜欢的方式画一画。,？颗,0,0,0,1,0,1,2,0,1,2,3,0,1,2,3,4,0,1,2,3,4,5,0,1,2,3,4,5,6,0,1,2,3,4,5,6,7,0,1,2,3,4,5,6,7,8,0,1,2,3,4,5,6,7,8,9,0,1,2,3,4,5,6,7,8,9,10,0,1,2,3,4,5,6,7,8,9,10,11,0,1,2,3,4,5,6,7,8,9,10,11,12,0,1,2,3,4,5,6,7,8,9,10,11,12,13,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,14,17,一个一个数,两个两个数,五个五个数,1个十,1个十,6个一,？,16,2个十,20,练习：,（1）15是由()个十和()个一组成。,（2）()个十和()个一组成17。,（3）16前面一个数是(),后面一个数是()。,（4）与19相邻的两个数是()和()。,1,1,15,18,5,7,17,20,