The Art of Teaching Arithmetic a book for Span Classsearchtermclassspan
The Art of Teaching Arithmetic a book for Span Classsearchtermclassspan
Jeannie Barbara Thomson Davies
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rect. , multiplying the denominator. 130 THE ART OF TEACHING ARITHMETIC 2. The development of the ordinary rule for division by a fraction, " Invert the divisor and multiply, " can be taken in stages. Before beginning, it is wise to tell the children that this is difficult work which leads in the end to a simple result. (a) Make clear by easy examples that, if one quantity be divided by another, each must be expressed in the same unit; e. G. * ^ = 3; P tota 2 pints 2 pence makes no sense unless... we know the value of a 6 shillings . Pint in pence. - - K - is possible when shillings are changed to fourpences or pence. (6) Give examples of this type : " How many J-lb. Packets of tea can I make from 5j Ib. Tea ? " Children will use a quarter of a pound as the new unit: i. E. 5Jlb. -^ fib. = 21 (Jib. ) ^ 3(Jlb. ) =-V L = 7. Lead on to examples where remainder occurs; e. G. 7f Ib. -7- f Ib. = 23(J Ib. ) 4- 2(J Ib. ). This gives 11 whole packets each containing Ib. , and a single J Ib. Left over, which is, however, half a packet.
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