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Hello! The answer to the second volume of mathematics oral calculation in the fourth grade of primary school?
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

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