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I want the second volume of grade four 120 off-line mathematical calculation and 300 vertical mathematical calculation. Correct points! ! ! ! ! ! ! !
1, oral estimation:

900÷30 12×40 480÷80 16×6 12×7

420÷60 100×26 2400+300 5600÷70 320+780

90÷ 18 16×25 480+30 300-25×4 100-72÷8

689×5≈ 5430÷9≈ 3976÷8≈ 2080×4≈ 260×8≈

2, vertical calculation and checking calculation:

209×43 8652÷36

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