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Subtraction-fest 09 ~ Mental Subtraction By Elevating Both Numbers
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This video is the second of three in which I describe common mental subtraction methods. The subtraction methods that we use on paper are, generally, too cumbersome for mental calculation. Also, we rarely subtract large numbers mentally ... so we use different techniques in this case ... ones that don't require remembering lots of detail!
If two numbers are a certain distance apart, then adding the same number to both of them will "shift them" by the same amount and their difference will remain the same. We utilise this knowledge in order to make the bottom number (the subtrahend) easier to subtract ... by rounding it upwards!
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RATIONALE FOR THIS SERIES
Some of you have expressed quite some interest in different subtraction methods/algorithms. This resulted from my posting two lengthy videos in which I explained WHY different algorithms worked.
It became apparent, however, that I needed to create a series of much shorter videos in order to DEMONSTRATE these methods (and more) without the lengthy explanations in those first two videos.
If two numbers are a certain distance apart, then adding the same number to both of them will "shift them" by the same amount and their difference will remain the same. We utilise this knowledge in order to make the bottom number (the subtrahend) easier to subtract ... by rounding it upwards!
~~~~~~~~~~~~~~~~~~~
RATIONALE FOR THIS SERIES
Some of you have expressed quite some interest in different subtraction methods/algorithms. This resulted from my posting two lengthy videos in which I explained WHY different algorithms worked.
It became apparent, however, that I needed to create a series of much shorter videos in order to DEMONSTRATE these methods (and more) without the lengthy explanations in those first two videos.
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