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Page 43 and 44, the second volume of grade four, math training and excellent oral calculation.
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

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