1、
《整十数加、减整十数》课后练习
练习十四
2+3= 4+5= 2+3= 4+5=
20+30= 40+50= 20+30= 40+50=
6-4= 7-3= 6-4= 7-3=
60-40= 70-30= 60-40= 70-30=
2+3= 4+5= 2+3= 4+5=
20+30= 40+50= 20+30= 40+50=
6-4
2、 7-3= 6-4= 7-3=
60-40= 70-30= 60-40= 70-30=
2+3= 4+5= 2+3= 4+5=
20+30= 40+50= 20+30= 40+50=
6-4= 7-3= 6-4= 7-3=
60-40= 70-30= 60-40= 70-30=
2+3= 4+5= 2+3= 4+5=
20+30= 40+50= 20+30= 40+50=
6-4= 7-3= 6-4= 7-3=
60-40= 70-30= 60-40= 70-30=