24. 24
Let us divide the figures
into two groups.
(Elementary school
2nd graders)
From classification, guide
students to definitions of figures.
Practical example
Points of teaching about ¡°concept of sets¡±
(classification)
33. 33
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¡ô Line 1~10 cards, and add up the vertical rows
and the horizontal rows??? Each answer is 18.
3 5 8 91 4 76 102
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£²£³
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£µ
£¶£·
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£¹
34. 34
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¡ô Line 1~9 cards, and add up the vertical row,
the horizontal row, and diagonal rows???
Each answer is 15.
38. 38
See the changes in the slide-show
Change in time
Change in water volume (depth)
Proportional
relationship
Materials & teaching
aids
PowerPoint ºÝºÝߣs
Understanding corresponding
changes in numbers and volume
Development of home-made
teaching materials -5-
39. 39
A rectangular water tank is filled with water.
The chart shows the depth after every 5 minute.
Time (1 min.) 5 10 15 20 25 30
Water depth
(cm) 2 4 6 8 10 12