Teacher's Encyclopaedia of the Theory, Method, Practice, History and Development of Education at Home and Abroad

Whilst the greatest effort has been made to ensure the quality of this text, due to the historical nature of this content, in some rare cases there may be minor issues with legibility. Subtraction, being an inverse operation, is more difficult than addition. The symbolism 32 15 17 may be taken to represent the answer to two questions (i) What number added to fifteen gives thirty-two? (ii) What wil...