Number Theory: An Old Fashioned Way Of Number Subtraction - Education - Nairaland
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| Number Theory: An Old Fashioned Way Of Number Subtraction by Nobody: 2:22pm On Oct 07, 2014 |
The attached picture below shows a way of doing subtraction that's probably different from what you learned in school. Rather than the basic "carry-the-1" approach, students are taught to see subtraction as a way of establishing the distance between two numbers. And the easiest way to do that is to establish the distance between various signposts. So the way to subtract 38 from 325 involves establishing the difference between 38 and 40 (2), 40 and 100 (60), 100 and 300 (200), and 300 and 325 (25). Adding 2 + 60 +200 + 25 gives you the answer: 287. What do you think about this method? Is it more complex/difficult than the conventional substraction method you wia thought in school? 1 Like
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