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The fourth grade, the second volume, 400 crossings is the best.
640÷80= 8

15×5= 75

23×3= 69

12×2×5= 120

480÷80= 6

16×5= 80

27×3= 8 1

90÷ 15= 6

48÷4= 12

640÷ 16=40

39÷3= 13

24×20= 480

32×3= 96

48÷ 16= 3

12×8=96

27×3= 8 1

56÷ 14= 4

24÷8=3

14×2=28

83-45= 38

560÷80=7

96÷24=4

40÷20=2

40×30= 1200

37+26=63

76-39=37

605+59= 664

30×23= 690

12×8=96

27+32=59

48+27=75

4500×20=90000

73+ 15 =88

120×600 =72000

200×360=72000

6800×400= 2720000

280+270=550

4×2500= 10000

6000÷40= 150

5× 1280= 6400

3 10-70=240

400× 14=5600

470+ 180=650

1000÷25= 40

160×600=96000

20×420=8400

290×300= 87000

8 100÷300= 27

7600÷200=38

7600÷400= 19

680+270=950

980÷ 14= 70

4200÷30= 140

6× 1300=7800

1300×50= 65000

200×48= 9600

930-660=270

530+280=8 10

9200÷400= 23

840÷2 1= 40

180×500=90000

8000÷500 = 16

1900÷20= 95

200× 160= 32000

8700÷300=29

300×330=99000

3× 1400=4200

7000÷ 14= 500

600÷ 12= 50

9600÷80= 120

140×300= 42000

8800÷40= 220

9600÷800= 12

750-290=460

5×490= 2450

760×20= 15200

7500÷500= 15

370×200=74000

650÷ 13=50

8600-4200=4400

240×4=960

640÷80=8

15× 10= 150

12× 1 1= 132

160×30=4800

220×40=8800

104×5=520

4500÷50=90

120×2=240

90÷30=3

270÷30=9

270×30=8 100

84÷2 1=4

76÷9=8.4

66÷7=9.3

100-54=46

123+ 15= 138

360÷4=90

55÷5= 1 1

32×6= 192 7000÷70= 100

200÷40=5

180÷30=6

240÷40=6

35×2=70

140×7=980

13×6=78

280×3=840

350×2=700

50× 1 1=550

250×6= 1500

7200+900= 8 100

4 10-20 1= 209