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Chapter 7 The Study Of Numbers Up To 20

8–3=6–

10 = 7 – 4

2 Reading or writing common differences in staircases Build a staircase with a common difference of a yellow rod between the steps. Start with the red rod. Who can read the first step of the staircase? (7 – 2 = 5). The last step? (e.g. 22 – 17 = 5). One of the other steps? (12 – 7 = 5). Who can read the whole staircase upwards? (5 = 7 – 2 = 12 – 7 = 17 – 12 = 22 – 17). Who can read the staircase both upwards and downwards? Try writing down what you see in each step. (7 – 2 = 5

12 – 7 = 5, etc.).

See exercises 3 to 5 in Part III, Book I of Mathematics. 3 Adding or subtracting the same value in each line to maintain the common difference 1

Place the dark green and pink rods side by side. Which rod makes up the difference between the two rods?

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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

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