Chapter 8 The Study Of Numbers Up To 100

ten white rods and that 2 orange rods are 2 × 10 = 20 white ones, so there is little need to explain that 3 orange rods end to end are 3 × 10 = 30 white ones, and so on. He may soon discover that it is more convenient to place his rods side by side rather than end to end.

The Four Operations With Rods End To End (Or Side By Side) The introduction of these trains of rods is followed by a study of the four operations. The pattern outlined for studying a particular number (see Chapter 7) may be adapted to meet the following requirements: 1

the study should involve multiples of ten only, such multiplication and division facts as 30 = 3 × 10 and 3 = × 30, 10 = × 30 being examined (not, at this stage, 5 × 6 = 30 or 14 + 16 = 30);

2 the relationships between the numbers being examined should be emphasized. The following exercises indicate more clearly what is required: 10 + (4 × 10) =

× 60 =

(2 × 10) + (3 × 10) =

(

30 + 50 =

100 – 60 = 2 ×

100 – 30 =

70 — (

157

× 40) + = 50

× l00) =

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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