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Mixed problems of mathematical oral calculation
The math oral calculation questions in the second volume of the fourth grade of primary school are as follows:

1、45+ 15×6= 135

2、250÷5×8=400

3、6×5÷2×4=60

4、30×3+8=98

5、400÷4+20×5= 200

6、 10+ 12÷3+20=34

7、(80÷20+80)÷4=2 1

8、70+( 100- 10×5)= 120

9、360÷40= 9

10、40×20= 800

1 1、80-25= 55

12、70+45= 1 15

13、90×2= 180

14、 16×6= 96

15、300×6= 1800

16、540÷9=60

17、30×20= 600

18、400÷4= 100

19、350-80= 270

20、 160+70=230