-
1.
口算
20+50= | 80-30= | 58-8= | 70+6= | 91-8= |
45+3= | 36+4= | 85+30= | 54+9= | 28-6= |
23+20= | 77+5= | 24-7= | 87-50= | 25+30= |
72-9= | 23-8= | 57-40= | 45-3= | 37+8= |
-
1.
口算
15+4= | 12-5= | 4+9= | 8+7-9= |
14-8= | 16-9= | 15-6= | 17-8+5 |
57-7= | 40+5= | 70+8= | 80-50-10= |
8+20= | 57-50= | 35-5= | 14-5+90= |
-
2.
直接写出得数。
51+20= | 7+52= | 58-5= | 53-50+5= |
69-7= | 6+8= | 17-9= | 75-60+80= |
90-10= | 40+38= | 64-40= | 85-30+2= |
39+40= | 15-8= | 30+60= | 32+50-40= |
-
3.
直接写出得数。
17-9= | 32-30= | 15+4= | 70-40+4= |
5+43= | 46-6= | 29+20= | 16-8+20= |
70+25= | 26+40= | 89-7= | 42-2-20= |
73-70= | 7+62= | 15-7= | 4+3+60= |