12×14=
17×23=
23×41=
13×23=
26×22=
42×21=
15×42=
13×12=
24×31=
24×23=
22×34=
27×14=
37×12=
35×21=
21×33=
31×32=
12×43=
12×42=
18×21=
29×22=
27×22=
29×12=
44×12=
36×12=
25×22=
15×32=
33×31=
22×31=
21×12=
33×12=
17×12=
19×21=
15×21=
14×21=
18×13=
21×44=
13×31=
33×13=
26×12=
34×21=
15×22=
17×21=
19×12=
27×12=
41×12=
22×21=
22×19=
31×21=
17×23=
23×41=
13×23=
26×22=
42×21=
15×42=
13×12=
24×31=
24×23=
22×34=
27×14=
37×12=
35×21=
21×33=
31×32=
12×43=
12×42=
18×21=
29×22=
27×22=
29×12=
44×12=
36×12=
25×22=
15×32=
33×31=
22×31=
21×12=
33×12=
17×12=
19×21=
15×21=
14×21=
18×13=
21×44=
13×31=
33×13=
26×12=
34×21=
15×22=
17×21=
19×12=
27×12=
41×12=
22×21=
22×19=
31×21=
答案:
12×14=168,想:12×10=120,12×4=48,120+48=168
17×23=391,想:17×20=340,17×3=51,340+51=391
23×41=943,想:23×40=920,23×1=23,920+23=943
13×23=299,想:13×20=260,13×3=39,260+39=299
26×22=572,想:26×20=520,26×2=52,520+52=572
42×21=882,想:42×20=840,42×1=42,840+42=882
15×42=630,想:15×40=600,15×2=30,600+30=630
13×12=156,想:13×10=130,13×2=26,130+26=156
24×31=744,想:24×30=720,24×1=24,720+24=744
24×23=552,想:24×20=480,24×3=72,480+72=552
22×34=748,想:22×30=660,22×4=88,660+88=748
27×14=378,想:27×10=270,27×4=108,270+108=378
37×12=444,想:37×10=370,37×2=74,370+74=444
35×21=735,想:35×20=700,35×1=35,700+35=735
21×33=693,想:21×30=630,21×3=63,630+63=693
31×32=992,想:31×30=930,31×2=62,930+62=992
12×43=516,想:12×40=480,12×3=36,480+36=516
12×42=504,想:12×40=480,12×2=24,480+24=504
18×21=378,想:18×20=360,18×1=18,360+18=378
29×22=638,想:29×20=580,29×2=58,580+58=638
27×22=594,想:27×20=540,27×2=54,540+54=594
29×12=348,想:29×10=290,29×2=58,290+58=348
44×12=528,想:44×10=440,44×2=88,440+88=528
36×12=432,想:36×10=360,36×2=72,360+72=432
25×22=550,想:25×20=500,25×2=50,500+50=550
15×32=480,想:15×30=450,15×2=30,450+30=480
33×31=1023,想:33×30=990,33×1=33,990+33=1023
22×31=682,想:22×30=660,22×1=22,660+22=682
21×12=252,想:21×10=210,21×2=42,210+42=252
33×12=396,想:33×10=330,33×2=66,330+66=396
17×12=204,想:17×10=170,17×2=34,170+34=204
19×21=399,想:19×20=380,19×1=19,380+19=399
15×21=315,想:15×20=300,15×1=15,300+15=315
14×21=294,想:14×20=280,14×1=14,280+14=294
18×13=234,想:18×10=180,18×3=54,180+54=234
21×44=924,想:21×40=840,21×4=84,840+84=924
13×31=403,想:13×30=390,13×1=13,390+13=403
33×13=429,想:33×30=390,33×3=99,390+99=429(原13×33=429,交换乘数结果不变)
26×12=312,想:26×10=260,26×2=52,260+52=312
34×21=714,想:34×20=680,34×1=34,680+34=714
15×22=330,想:15×20=300,15×2=30,300+30=330
17×21=357,想:17×20=340,17×1=17,340+17=357
19×12=228,想:19×10=190,19×2=38,190+38=228
27×12=324,想:27×10=270,27×2=54,270+54=324
41×12=492,想:41×10=410,41×2=82,410+82=492
22×21=462,想:22×20=440,22×1=22,440+22=462
22×19=418,想:22×20=440,22×1=22,440-22=418
31×21=651,想:31×20=620,31×1=31,620+31=651
17×23=391,想:17×20=340,17×3=51,340+51=391
23×41=943,想:23×40=920,23×1=23,920+23=943
13×23=299,想:13×20=260,13×3=39,260+39=299
26×22=572,想:26×20=520,26×2=52,520+52=572
42×21=882,想:42×20=840,42×1=42,840+42=882
15×42=630,想:15×40=600,15×2=30,600+30=630
13×12=156,想:13×10=130,13×2=26,130+26=156
24×31=744,想:24×30=720,24×1=24,720+24=744
24×23=552,想:24×20=480,24×3=72,480+72=552
22×34=748,想:22×30=660,22×4=88,660+88=748
27×14=378,想:27×10=270,27×4=108,270+108=378
37×12=444,想:37×10=370,37×2=74,370+74=444
35×21=735,想:35×20=700,35×1=35,700+35=735
21×33=693,想:21×30=630,21×3=63,630+63=693
31×32=992,想:31×30=930,31×2=62,930+62=992
12×43=516,想:12×40=480,12×3=36,480+36=516
12×42=504,想:12×40=480,12×2=24,480+24=504
18×21=378,想:18×20=360,18×1=18,360+18=378
29×22=638,想:29×20=580,29×2=58,580+58=638
27×22=594,想:27×20=540,27×2=54,540+54=594
29×12=348,想:29×10=290,29×2=58,290+58=348
44×12=528,想:44×10=440,44×2=88,440+88=528
36×12=432,想:36×10=360,36×2=72,360+72=432
25×22=550,想:25×20=500,25×2=50,500+50=550
15×32=480,想:15×30=450,15×2=30,450+30=480
33×31=1023,想:33×30=990,33×1=33,990+33=1023
22×31=682,想:22×30=660,22×1=22,660+22=682
21×12=252,想:21×10=210,21×2=42,210+42=252
33×12=396,想:33×10=330,33×2=66,330+66=396
17×12=204,想:17×10=170,17×2=34,170+34=204
19×21=399,想:19×20=380,19×1=19,380+19=399
15×21=315,想:15×20=300,15×1=15,300+15=315
14×21=294,想:14×20=280,14×1=14,280+14=294
18×13=234,想:18×10=180,18×3=54,180+54=234
21×44=924,想:21×40=840,21×4=84,840+84=924
13×31=403,想:13×30=390,13×1=13,390+13=403
33×13=429,想:33×30=390,33×3=99,390+99=429(原13×33=429,交换乘数结果不变)
26×12=312,想:26×10=260,26×2=52,260+52=312
34×21=714,想:34×20=680,34×1=34,680+34=714
15×22=330,想:15×20=300,15×2=30,300+30=330
17×21=357,想:17×20=340,17×1=17,340+17=357
19×12=228,想:19×10=190,19×2=38,190+38=228
27×12=324,想:27×10=270,27×2=54,270+54=324
41×12=492,想:41×10=410,41×2=82,410+82=492
22×21=462,想:22×20=440,22×1=22,440+22=462
22×19=418,想:22×20=440,22×1=22,440-22=418
31×21=651,想:31×20=620,31×1=31,620+31=651
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