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THE NEW  STUDENT'S  REFERENCE  WORK

2153

Draw the diagram on the blackboard. Frequently change the centre number. Let the teacher or some pupil point to a number in the outer rim, requiring the children to give at once the product.

Drill in multiplication.

50   6     10    7    3     9     5     12    2     8     II      I      4   20

4

7

2

5

_                                                  _

3 9

I

_6___________________•_________________

12 10 II 40

Pupils should copy and fill in vacant squares, using numbers in vertical column as multipliers.

The following drill is effective in securing the desired quickness, as pupils make use of facts learned in the multiplication tables.