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邮递员叔叔送信. 邮递员工作 10 天, 要送多少份报纸?. 工作 30 天,要送多少份报纸?. 300×10 =. 300×30 =. 300×10 = 3000. 300×3 = 900. 300×30 = 9000. 要送多少封信?. 要送多少封信?. 30×60 = 1800. 10×60 = 600. 80×10 = 60×20 = 50×40 = 700×20 = 90×90 = 40×80 =

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6741468

邮递员工作10天,

要送多少份报纸?

工作30天,要送多少份报纸?

300×10=

300×30=

300×10=3000

300×3=900

300×30=9000

要送多少封信?

要送多少封信?

30×60=1800

10×60=600


6741468

80×10= 60×20=

50×40= 700×20=

90×90= 40×80=

24×10= 12×200=

  • 做一做

800

1200

2000

14000

8100

3200

2400

240


6741468

18 ≈ 20

22 ×20=440

22 ≈ 20

18 ×20=360

能坐下

18 ≈ 20

22 ≈ 20

20 ×20=400


6741468

每行约有

22个字

一页有23行

23 ≈ 20

22 ≈ 20

20×20=400(个)

23 ≈ 20

20×22=440(个)

一页大约有多少个字?



6741468

20×8=160(角)

30×6=180(角)

160 + 180 = 340 (角)

20×8 + 30×6= 340 (角)

一共要付多少钱?

= 34(元)


6741468

9×99

= 9 × (100-1)

= 900-9

= 891


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