方法1两位数加两位数的进位加法口诀加9要减1加8要减2加7要减3.docx
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方法1两位数加两位数的进位加法口诀加9要减1加8要减2加7要减3
方法1.两位数加两位数的进位加法:
口诀:
加9要减1,加8要减2,加7要减3,
加6要减4,加5要减5,加4要减6,加3要减7,加2要减8,加1要减9(注:
口决中的加几都是说个位上的数)。
方法2.两位数减两位数的退位减法。
口决:
口诀:
减9要加1,减8要加2,减7要加3,减6要加4,减5要加5,减4要加6,减3要加7,减2要加8,减1要加9。
(注:
口决中的减几都是说减个位上的数)。
45
-35=
29
+24=
72
+7=
87
-72=
48
+27=
60
-29=
21
+55=
62
+26=
1+35=
31
-20=
71
+25=
75
+24=
94
-25=
23
+41=
20
+55=
24
+43=
43
+1=
68
+6=
57
-44=
74
-55=
97
-7=
50
+23=
83
-22=
1+18=
25
+58=
49
+25=
46
-28=
100-57=
47
-6=
5+91=
66
+34=
76
-65=
61
-55=
15
+77=
29
+68=
75
-14=
60
+6=
2+61=
50
+20=
10
+32=
29
+71=
12
+17=
86
-38=
62
+32=
51
-33=
68
+20=
92
-58=
78
-15=
94
-39=
47
-29=
11
+87=
50
+16=
41
-11=
86
-73=
91
-73=
76
+4=
97
-38=
97
-34=
44
+5=
100-56=
11
+66=
73
+26=
41
+34=
36
+49=
9+57=
94
-54=
20
+20=
45
+13=
97
-62=
2+81=
65
+24=
13
+
55=
44
-37=
43
+53=
4+20=
59
-
54=
69+31=
8+6=
45+40=
4-1=
55
-54=
87
-34=
49
+49=
84
+
1=
73
-37=
62
-3=
25
+45=
3+67=
84
-50=
79
-68=
84
-71=
54
+
46=
13
+84=
17
+46=
80
-66=
52
-
11=
13
-4=
39
+55=
80
-70=
33
-
9=
16
+71=
74
-33=
33
+25=
58
-
8=
94
-81=
94
-47=
93
-68=
12
+
7=
51
-11=
64
-11=
31
+27=
58
+
16=
76
-14=
65
-50=
99
-71=
53
-
4=
90
-38=
88
-10=
51
-3=
23
-
10=
43
+23=
65
+12=
99
-14=
21
+
35=
62+3=
43+41=
4+76=
48+7=
63
-24=
20
+33=
20
+53=
2+55=
56
+14=
92
-49=
75
-6=
44
-
31=
81+1=
19+76=
9+23=
59+3=
19
+10=
98
-86=
52
+28=
16
-14=
96
-41=
65
+2=
37
+47=
30
+41=
25
+10=
80
+1=
61
-48=
67
+12=
100-89=
84
-10=
7+36=
65
-21=
61
+9=
57
-19=
33
-15=
23
+24=
9+16=
75
+13=
61
-25=
8+72=
4+35=
66-45=
52-5=
9+54=
12
+2=
21
+25=
27
+68=
51
-49=
16
+68=
27
+34=
62
-61=
32
-1=
46
-4=
83
-35=
90
-89=
92
-83=
58
-33=
71
-58=
16
+84=
39
-13=
50
-42=
90
+3=
45
+55=
81
-2=
73
+15=
68
-52=
68
+15=
74
-49=
49
+30=
43
-30=
45
+17=
69
-29=
43
-27=
80
-54=
91
-25=
83
+7=
20
+75=
79
-56=
79
+8=
64
-32=
99
-29=
36
+64=
59
+37=
48
-29=
19
+56=
7+35=
4+54=
39
-36=
33+55=
34+8=
68-9=
8+91=
35
+46=
59
-36=
57
+15=
89
-53=
34
+13=
59
-27=
94
-34=
6+67=
59
-13=
67
+19=
90
-33=
55
+5=
99
-22=
20
+16=
27
+45=
23
-17=
98
-63=
64
+17=
50
+11=
43
+42=
49
+31=
37
+55=
94
-20=
68
+15=
91
+2=
78
+11=
34
+24=
64
-4=
92
-40=
17
+43=
95
-75=
68
-11=
86
-26=
98
-92=
39
-15=
10
+15=
54
-46=
81
-9=
30
+12=
2+94=
69-3=
16+43=
54-5=
21+5=
74
-70=
58
+13=
45
+36=
34
-16=
79
-68=
92
+3=
16
+7=
95
-83=
45
+21=
63
-39=
31
+28=
17
+43=
11
-6=
65
-39=
48
+51=
91
-37=
23
+36=
62
+12=
51
+25=
78
-
57=
23
+28=
83
-35=
8+81=
68
-
44=
90
+9=
27
-12=
79
+6=
71
-
17=
25
+75=
35
+27=
41
+39=
9+5=
10
+34=
65
-17=
91
-20=
22
+
38=
84
+3=
57
-46=
14
+12=
27
-
14=
57
+31=
45
+45=
92
-79=
29
+
30=
79
-65=
34
+65=
80
-20=
83
-
31=
84
-38=
72
-4=
38
-15=
74
-
68=
87
-31=
41
-21=
55
-39=
27
+
70=
60
+22=
35
+53=
20
+22=
24
+
49=
50
+9=
60
+16=
33
-3=
45
-
43=
56
-6=
15
-11=
47
-22=
65
-
23=
68
-57=
90
-5=
69
-36=
100-28=
96
-90=
81
+2=
10
+3=
37
+
47=
15
+83=
18
+3=
72
-30=
42
+
2=
81
+14=
71
-69=
33
+30=
48
-
7=
47
+34=
50
+36=
72
-6=
17
+
1=
99
-65=
27
+71=
8+23=
50
+
18=
32
+65=
82
+6=
89
-51=
63
+
10=
19
+12=
55
-21=
20
-6=
59
-
38=
48
+18=
98
-25=
8+57=
23
-
6=
45
-35=
7+46=
71
-20=
80
-
6=
74
+24=
25
+6=
13
+41=
68
-
6=
87-16=
65-4=
5+15=
59-5=
93
-13=
7+61=
18
+28=
81
+18=
46-41=
53+3=
90+5=
24-3=
58
-47=
31
+4=
29
+54=
78
+4=
38
-20=
76
-65=
67
-64=
55
-16=
95
-14=
68
-55=
81
-25=
26
+50=
57
+5=
15
+42=
23
-9=
80
-61=
50
-24=
32
+14=
61
+27=
20
+5=
68
-26=
12
+76=
28
-22=
88
-8=
42
+49=
69
-30=
92
-2=
86
-77=
67
-56=
20
+59=
47
+22=
51
+27=
86
+12=
55
-15=
2+73=
13
+74=
100-10=
19
+49=
58
+28=
80
+18=
48
-16=
98
-11=
88
+4=
93
-33=
64
-42=
31
-3=
90
-5=
34
+53=
39
+28=
9+2=
21
+37=
72
+23=
14
+13=
58
+29=
100-58=
40
-33=
17
+59=
54
+25=
28
+48=
76
+14=
28
+34=
35
+35=
42
-27=
83
-62=
21
+37=
60
+6=
100-7=
69
-8=
66
+30=
29
-14=
37
+45=
98
-44=
98
-96=
48
+7=
66
-63=
65
+9=
38
+38=
80
-33=
79
-55=
29
+67=
33
+41=
75
-63=
51
-25=
39
-23=
84
-53=
84
-31=
46
-7=
82
+13=
82
-50=
93
-21=
82
-27=
93
-38=
2+45=
23
+64=
82
+15=
73
+23=
16
+21=
58
-46=
4+20=
95
-26=
34
-18=
59
+5=
84
-
74
=
57
+
19=
5+31=
11+46=
43-7=
39+9=
25
+73=
57
+35=
69
-
11
=
90
-
29=
75
-29=
68
-25=
52
+
43
=
89
-
42=
32
+49=
59
-35=
14
+
42
=
44
-
28=
14+3=
2+3=
77+9=
8+10=
76
-57=
28
+28=
55
+
21
=
50
-
19=
27
+69=
48
+16=
28
+
53
=
18
+
56=
65
-17=
70
-47=
83
-
76
=
79
-
32=
52
-1=
27
+39=
19
-
15
=
20
+
26=
1+81=
76
-58=
83
-
40
=
34
-
13=
90
+6=
61
-3=
50
-
19
=
27
+
34=
51
-27=
89
-56=
89
-
10
=
89
-
67=
12+52=
87+3=
56+9=
5+48=
54
+1=
87
+5=
89-
70
=
96
-
43=
43
+32=
2+48=
22-
10
=
92
-
63=
22
+62=
91
-57=
44-
32
=
48
-
47=
90
-87=
87
+11=
64-
42
=
53
+
22=
8+6=
83-23=
8-3=
16+70=
14
+38=
25
+72=
78-16=
46
-29=
9+82=
61
+29=
82-35=
12
+58=
19
+72=
17
+28=
8+31=
99
-45=
53
+33=
64
-61=
71-68=
7+5=
32
+18=
86
-30=
8+91=
2+75=
83
-82=
34
+50=
24+18=
95
-75=
99
-41=
77
+9=
76-12=
17
+3=
78
+2=
96
-31=
25
+8=
72
+
10=
20
-8=
65
+21=
17
+40=
70
+
26=
65
+25=
9-5=
37
-32=
39
+
45=
41
+39=
89
-88=
74
-33=
29
+
24=
79
+8=
36
+22=
92
-66=
60
-
29=
91
-11=
58
-12=
61
+25=
31
-
20=
42
+20=
92
-36=
80
-2=
23
+
41=
65
-59=
33
+58=
100-44=
68
+
6=
32
+64=
48
+13=
39
-4=
50
+
23=
96
-38=
57
+13=
89
-54=
49
+
25=
18-1=
24+53=
91+1=
5+91=
43
+33=
100-71=
79
-35=
15
+
77=
100-64=
33
-30=
65
+34=
2+61=
3+49=
14
-1=
76
+22=
12
+
17=
88
-32=
25
+29=
96
-27=
68
+
20=
38
+35=
57
+41=
75
-15=
47
-
29=
54
+31=
60
-4=
95
-52=
86
-
73=
12
+54=
85
+6=
88
-47=
97
-
34=
36+17=
8-3=
41-8=
73+26=
9+35=
59
+17=
35
-15=
94
-
54=
27
+55=
98
-71=
84
-76=
2+81=
4+16=
63
-5=
88
-10=
43
+
53=
47+35=
93-8=
56-1=
8+6=
35+20=
6+7=
41+2=
87-34=
83
+13=
24
+42=
19
-17=
62
-3=
46
-9=
67
-30=
20
+1=
79
-68=
56
+16=
74
+15=
48
-25=
17
+46=
33
-17=
71
-58=
14
+14=
39
+55=
11+9=
80-3=
95-4=
64+3=
25+7=
62-2=
83+5=
83+10=
56+20=
64+6=
65+3=
15-3=
32+6=
29-7=
35+2=
73+4=
43
+5=
87
+10=
39
-3=
48
-30=
81
-2=
60
+8=
39
+10=
76
+10=
48-9=
47-8=
52-4=
43-8=
40-2=
27-9=
32-4=
41-2=
50-8=
63-9=
37-8=
56-20=
75-9=
92-3=
42-7=
71-6=
47-8=
26-7=
52-3=
69-10=
80-2=
36-9=
78-4=
65-8=
72-2=
45-9=
86-8=
96-2=
40-2=
46-9=
43-4=
18-2=
35+5=
85+2=
59-4=
78+10=
64+6=
32+7=
49-5=
63+3=
60-4=
11+20=
45-3=
30+8=
25+4=
36-5=
84+4=
52-3=
88-4=
76+0=
93-3=
18+5=
56+20=
64+6=
65+3=
15-3=
12+6=
29-7=
33+2=
3+40=
23+5=
37+1=
29-3=
38-3=
18-2=
30+8=
43+1=
86+2=
23+7=
47+4=
88+3=
47+6=
26+8=
19+6=
28+5=
53+6=
23+8=
89+6=
75+5=
86+6=
26+9=
25+6=
50+37=
49+7=
61+9=
85+4=
91+8=
82+5=
73+7=
37+4=
78+3=
27+60=
9+25=
35+6=
2+40=
86+2=
16+9=
5+18=
17+3=
36+6=
48+8=
35+8=
4+19=
7+26=
39+8=
26+7=
7+38=
6+18=
32+8=
25+5=
13+7=
86+8=
16+9=
34+6=
5+37=
14+7=
39+2=
27+4=
50+5=
54+9=
10
+40=
6+10=
18
+50=
74
+6=
23+70=
47+4=
88+3=
47+6=
26
+8=
19
+60=
48
+50=
23
+6=
83+8=
19+6=
75+5=
36+6=
98-4=
63-5=
15+4=
29+5=
10+8=
99-9=
15-4=
4+37=
30-3=
24-9=
70+3=
40+6=
25+4=
38-8=
39+8=
19+60=
95-40=
82-5=
78+5=
37+9=
70+30=
84-2=
68+7=
70+60=
68-9=
60-7=
87+9=
37+2=
38-9=
71+9=
39+10=
99+1=
88-9=
70-5=
39+8=
78+50=
58-10=
30-3=
48+7=
18+7=
20
+5=
64
-32=
87
-
72
=
50-24=
88
-8=
48
-29=
62
+
26
=
68-26=
86
-77=
39
-36=
75
+
24
=
42+49=
51
+27=
8+91=
24
+
43
=
67-56=
13
+74=
89
-53=
74
-
55
=
86+12=
80
+18=
6+67=
1+18=
100-10=
93
-33=
55
+5=
100-57=
48-16=
34
+53=
23
-17=
76
-
65
=
64-42=
72
+23=
43
+42=
75
-
14
=
39+28=
40
-33=
68
+15=
10
+
32
=
14+13=
76
+14=
64
-4=
62
+
32
=
17+59=
83
-62=
68
-11=
78
-
15
=
28+34=
69
-8=
10
+15=
50
+
16
=
21+37=
98
-44=
2+94=
76
+
4=
66+30=
65
+9=
21
+5=
100-56=
98-96=
29
+67=
34
-16=
36
+
49
=
38+38=
39
-23=
95
-83=
45
+
13
=
33+41=
82
+13=
17
+43=
13
+
55
=
84-53=
93
-38=
91
-37=
59
-
54
=
82-50=
73+23=
78-57=
4-1=
2+45=
95
-26=
68
-44=
8