1. When you know to compare the same number of objects, it is not affected by external conditions such as shape and container size. 2. Learn to explore and perceive the invariance of quantity by measuring and comparing.

3. Can feel the relationship between things and quantity from life and exploration, and appreciate the importance and fun of mathematics. Activity preparation: 1. Ppt courseware

2. Some rice, some containers of different sizes, some containers of the same size, some water, measuring cups and cups of different shapes.

Some mung beans, some corn grits, some sand and some snowflakes.

The container I provided is safe and light, which is convenient for children to measure and compare. These are all things that can be seen everywhere in daily life, and children are also very interested.

Highlights and difficulties of the activity:

Key point: the number of perceivable things is not affected by external conditions such as shape and container size. Difficulties: Perceive the meaning of conservation and learn to choose the same object to measure.

Conservation of Mathematics in Large Classes _ Baidu Library/Link? URL = qewexzpxhw 6 jej 8 osfvshjgvkttkqn 8 mbibqubtv 8 yftg 4-kjhrye 9 _ sp 6 uoly 6 kcvgny _ 3 uqs-7 fc 6 jcx 9 e 2 fffzjruglhntyfvs 4kw