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两位数乘两位数经典巧算附答案
2.
头十尾同
11
×
91=1001
12
×
92=1104
13
×
93=1209
14
×
94=
1316
15
×
95=1425
16
×
96=1536
17
×
97=1649
18
×
98=1764
19
×
99= 1881
21
×
91= 1901
22
×
82=1804
23
×
83=1909
24
×
84=2016
25
×
85= 2125
28
×
88= 2464
29
×
89= 2581
33
×
73= 2609
34
×
74=2516
37
×
77=2849
38
×
78=2964
42
×
62=2604
43
×
63=2709
46
×
66=3036
47
×
67=3149
51
×
51=2601
52
×
52=2704
56
×
56=3136
57
×
57=3249
两位数乘两位数经典巧算
-BB
19
×
21=399
18
×
22= 396
15
×
25=375
14
×
26=364
11
×
29=319
29
×
31=899
36
×
34=884
25
×
35=875
22
×
38=836
21
×
39=819
37
×
43=1591
36
×
44=1584
33
×
47= 1551
32
×
48=1536
26
×
86= 2236
31
×
71=2201
35
×
75=2625
39
×
79=3081
44
×
64=2816
48
×
68=3264
53
×
53=2809
58
×
58=3364
17
×
23=391
13
×
27=
351
28
×
32=896
24
×
36= 864
39
×
41=1599
35
×
45=1575
31
×
49= 1519
27
×
87=2349
32
×
72=2304
36
×
76=2736
41
×
61=2501
45
×
65=2925
49
×
69=3381
54
×
54=2916
59
×
59=3481
16
×
24=384
12
×
28=336
27
×
33=891
23
×
37=851
38
×
42=1596
34
×
46=1564
49
×
51=2499