一、口算练习。
12+6=
29-7=
33+2=
3+40=
15+4=
53+6=
78+5=
23+5=
37+1=
29-3=
38-3=
15-4=
36+8=
19+6=
18-2=
30+8=
43+1=
86+2=
70+3=
47+6=
39+8=
30-2=
72-2=
66-4=
39-2=
20-9=
83+70=
67+40=
53+5=
35+2=
39-4=
8+50=
20-1=
17+9=
40+6=
62+7=
89-5=
63+3=
34-2=
28+50=
50-4=
11+2=
53-3=
60+8=
80-7=
68+5=
32+4=
26-5=
84+4=
35-10=
71+9=
88+3=
18-4=
66+10=
83-3=
95-40=
71+5=
60-5=
36+3=
58+30=
28-7=
87-10=
62-2=
80-6=
11+9=
80-3=
95-4=
64+3=
98-4=
25+7=
83+5=
83+10=
10+8=
56+20=
64+6=
65+3=
15-3=
30-3=
32+6=
29-7=
35+2=
73+4=
25+4=
43+5=
87+10=
39-3=
48-30=
81-2=
60+8=
39+10=
76+10=
70+30=
48-9=
47-8=
52-4=
43-8=