,在这一单元里,你学习了 哪些数学知识?,1、数的组成。,2、数的顺序。,3、大小比较。,4、不进位加法。,5、不退位减法。,1120各数的认识,1、想一想,说一说。,2、拨一拨,说一说。,3+2=5,10+5=15,10,3,5,13 + 2 =,15,3、算一算,议一议。,8-6=2,10+2=12,10,8,2,18 - 6 =,12,3、算一算,议一议。,3、算一算,议一议。,12 + 5 - 6 =,12+5= 17,17,17-6= 11,11,1、填合适的数。,12,14,15,16,19,20,14,12,4,2,17,=,15,14,10,=,11,13,3、按年龄大小排一排。,2,12,15,20,4、在圈里填写120中符合要求的数。,十位上是1的数。,个位上是0的数。,10,11,12,12,13,14,15,16,17,18,19,10,0,20,5、计算。,10 + 3 =,13,15 - 10 =,18 - 8 =,11 + 6 =,4 + 13 + 2 =,4 + 13 + 2 =,7 + 2 =,18 - 6 =,14 + 5 =,17 - 6 =,17 3 + 1 =,5,10,17,19,9,12,19,11,15,6、说一说。,7、一共有多少只动物?,10,+,5,16,