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PowerPoint Slideshow about ' ???????' - oren-garcia

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Presentation Transcript

300×10＝

300×30＝

300×10＝3000

300×3＝900

300×30＝9000

30×60＝1800

10×60＝600

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

22 ×20＝440

22 ≈ 20

18 ×20＝360

18 ≈ 20

22 ≈ 20

20 ×20＝400

22个字

23 ≈ 20

22 ≈ 20

20×20＝400（个）

23 ≈ 20

20×22＝440（个）

20×8＝160（角）

30×6＝180（角）

160 + 180 ＝ 340 （角）

20×8 + 30×6＝ 340 （角）

＝ 34（元）

9×99

＝ 9 × （100－1）

＝ 900－9

＝ 891