Chapter 7 The Study Of Numbers Up To 20

say the values going down; say the values going up and then down; 4 Make a number chart for four. 1 5 9 13 17 21

2 6 10 14 18 22

3 7 11 15 19 23

4 8 12 16 20 24

5 Count by four, starting from 9. Go backwards after you pass 20. Continue, in writing, the following series of numbers until you pass 20: 2, 6 . . .

Developing The Concept Of Common Differences Between Pairs Of Numbers This idea is of fundamental importance for the method Gattegno recommends for dealing with subtraction. Understanding it, he says, eliminates all the various mechanical difficulties associated with the process. This will be discussed in detail later, but for the moment it will be sufficient to consider the importance of understanding the terms ‘difference’ and ‘common difference’ during the early stages of the course.

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The Cuisenaire Gattegno method of teaching Mathematics
The Cuisenaire Gattegno method of teaching Mathematics

The Cuisenaire Gattegno method of teaching Mathematics