'बहुत सारी गणित जानने के बजाय यह जानना अधिक उपयोगी है कि गणितीयकरण कैसे किया जाए'। यह कथन किसके द्वारा दिया गया है?

Which of the following are desirable characteristics of a good textbook? a. Content b. Presentation c. Editing d. Big in size

The Heuristic method of teaching was advocated by:

Which teaching method proceeds from concrete concepts to abstract concepts?