照样子口算。
算 23×12=276 48×21=1008
想 23×10=230 48×20=960
23×2=46 48×1=48
230+46=276 960+48=1008
24×25=
16×22=
63×12=
22×33=
23×34=
71×12=
12×31=
22×42=
14×41=
33×23=
32×14=
12×32=
22×13=
23×41=
22×15=
14×22=
44×22=
14×23=
25×12=
45×12=
34×12=
24×52=
32×13=
34×13=
22×43=
24×12=
23×31=
13×21=
23×42=
15×14=
24×21=
22×23=
18×16=
算 23×12=276 48×21=1008
想 23×10=230 48×20=960
23×2=46 48×1=48
230+46=276 960+48=1008
24×25=
16×22=
63×12=
22×33=
23×34=
71×12=
12×31=
22×42=
14×41=
33×23=
32×14=
12×32=
22×13=
23×41=
22×15=
14×22=
44×22=
14×23=
25×12=
45×12=
34×12=
24×52=
32×13=
34×13=
22×43=
24×12=
23×31=
13×21=
23×42=
15×14=
24×21=
22×23=
18×16=
答案:
24×25=600,想:24×20=480,24×5=120,480+120=600
16×22=352,想:16×20=320,16×2=32,320+32=352
63×12=756,想:63×10=630,63×2=126,630+126=756
22×33=726,想:22×30=660,22×3=66,660+66=726
23×34=782,想:23×30=690,23×4=92,690+92=782
71×12=852,想:71×10=710,71×2=142,710+142=852
12×31=372,想:12×30=360,12×1=12,360+12=372
22×42=924,想:22×40=880,22×2=44,880+44=924
14×41=574,想:14×40=560,14×1=14,560+14=574
33×23=759,想:33×20=660,33×3=99,660+99=759
32×14=448,想:32×10=320,32×4=128,320+128=448
12×32=384,想:12×30=360,12×2=24,360+24=384
22×13=286,想:22×10=220,22×3=66,220+66=286
23×41=943,想:23×40=920,23×1=23,920+23=943
22×15=330,想:22×10=220,22×5=110,220+110=330
14×22=308,想:14×20=280,14×2=28,280+28=308
44×22=968,想:44×20=880,44×2=88,880+88=968
14×23=322,想:14×20=280,14×3=42,280+42=322
25×12=300,想:25×10=250,25×2=50,250+50=300
45×12=540,想:45×10=450,45×2=90,450+90=540
34×12=408,想:34×10=340,34×2=68,340+68=408
24×52=1248,想:24×50=1200,24×2=48,1200+48=1248
32×13=416,想:32×10=320,32×3=96,320+96=416
34×13=442,想:34×10=340,34×3=102,340+102=442
22×43=946,想:22×40=880,22×3=66,880+66=946
24×12=288,想:24×10=240,24×2=48,240+48=288
23×31=713,想:23×30=690,23×1=23,690+23=713
13×21=273,想:13×20=260,13×1=13,260+13=273
23×42=966,想:23×40=920,23×2=46,920+46=966
15×14=210,想:15×10=150,15×4=60,150+60=210
24×21=504,想:24×20=480,24×1=24,480+24=504
22×23=506,想:22×20=440,22×3=66,440+66=506
18×16=288,想:18×10=180,18×6=108,180+108=288
16×22=352,想:16×20=320,16×2=32,320+32=352
63×12=756,想:63×10=630,63×2=126,630+126=756
22×33=726,想:22×30=660,22×3=66,660+66=726
23×34=782,想:23×30=690,23×4=92,690+92=782
71×12=852,想:71×10=710,71×2=142,710+142=852
12×31=372,想:12×30=360,12×1=12,360+12=372
22×42=924,想:22×40=880,22×2=44,880+44=924
14×41=574,想:14×40=560,14×1=14,560+14=574
33×23=759,想:33×20=660,33×3=99,660+99=759
32×14=448,想:32×10=320,32×4=128,320+128=448
12×32=384,想:12×30=360,12×2=24,360+24=384
22×13=286,想:22×10=220,22×3=66,220+66=286
23×41=943,想:23×40=920,23×1=23,920+23=943
22×15=330,想:22×10=220,22×5=110,220+110=330
14×22=308,想:14×20=280,14×2=28,280+28=308
44×22=968,想:44×20=880,44×2=88,880+88=968
14×23=322,想:14×20=280,14×3=42,280+42=322
25×12=300,想:25×10=250,25×2=50,250+50=300
45×12=540,想:45×10=450,45×2=90,450+90=540
34×12=408,想:34×10=340,34×2=68,340+68=408
24×52=1248,想:24×50=1200,24×2=48,1200+48=1248
32×13=416,想:32×10=320,32×3=96,320+96=416
34×13=442,想:34×10=340,34×3=102,340+102=442
22×43=946,想:22×40=880,22×3=66,880+66=946
24×12=288,想:24×10=240,24×2=48,240+48=288
23×31=713,想:23×30=690,23×1=23,690+23=713
13×21=273,想:13×20=260,13×1=13,260+13=273
23×42=966,想:23×40=920,23×2=46,920+46=966
15×14=210,想:15×10=150,15×4=60,150+60=210
24×21=504,想:24×20=480,24×1=24,480+24=504
22×23=506,想:22×20=440,22×3=66,440+66=506
18×16=288,想:18×10=180,18×6=108,180+108=288
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