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The second volume of the fourth grade, the oral calculation problem card, Jilin Education Press, 17, 18 pages, the answer.
16×6= 96

300×6= 1800

.540÷9=60

30×20= 600

400÷4= 100

350-80= 270

160+70=230

. 18-64÷8= 10

42÷6+20=27

40-5×7= 5

80+60÷3= 100

4 1+ 18÷2= 50

75- 1 1×5= 20

42+7-29= 20

5600÷80=70

.25× 16= 400

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