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)
25. 25
Proportion of vertical
length to horizontal
length
1:2
Laying out figures
Grade 3 & 4
Materials & teaching aids
Cardboard, Scissors, Ruler
(Ex.)10×20
Development of home-made
teaching materials -1-
38. 38
See the changes in the slide-show
Change in time
Change in water volume (depth)
Proportional
relationship
Materials & teaching
aids
PowerPoint Slides
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