1251 * (4*5) , 2452* (2*5) , 96300/(3*3) , 9810/(3*30) , 5*3142*4 , 21032*5*6, 15*2*12013, 3021*(2*5)

25020, 24520, 10700, 109, 62840, 630960, 360390, 30210

1) 1251*20=<span>25 020
2)2452*10=</span><span>24 520
3)96300/9=</span><span>10 700
4)9810/90=</span><span>109
5)</span>5*3142*4=<span>62 840
1)3142*4=</span><span>12 568
</span>2)12 568*5=62840
6)21032*5*6=630960
1)5*6=30
2)21032*30=630960
7)15 × 2 × 12 013<span> = </span><span>360 390
</span>1)15*2=30
2)12013*30=360390
8)3 021 × (2 × 5)<span>= </span><span>30 210
</span>1)2*5=10
2)3021*10=30210