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1280-850:5·4      

960:3+2800:400

4089+2005-47·2

270·3+210:42

425:25·900-998

4870-2593+25·10

6·3209:3

8·2023:4

5·23417-10305:5

4·12310:2-5890

                                                                                                                                             

1280-850:5*4=1280-170*4=1280-680=600

960:3+2800:400=320+700=1020

4089+2005-47*2=4089+2005-94=6000

270*3+210:42=810+5=815

425:25*900-998=17*900-998=15300-998=14320

4870-2593+25*10=2277+250=2527

6*3209:3=19254:3=6418

8*2023:4=16184:4=4046

5*23417-10305:5=117085-2061=115024

4*12310:2-5890=24620-5890=18730

1) 850:5=170   1,280-170=1,110  1,110х4=4,440

2)960:3=320  2,800:400=7   320+7=327

3)4,089+2,005=6,094   47х2=94   6094-94=6,000

4)270х3=810   210:42=5   810+5=815

5)425:25=17  900х17=15,300  15,300-998=14,302

6)4870-2593=2,277   25х10=250   2,277+250=2,527

7)3,209х6=19,254   19,254:3=6,418

8)2023х8=16,184   16,184:4=4,046

9)23,417х5=117,085   10,305:5=2,061   117,085-2,061=115,024

10)12,310:2=6,155   6,155х4=24,620   24,620-5890=18,730