Subtraction-fest 06 ~ Floating Digit Variation (Using Negative Markers)

This (sixth) subtraction method is a variation earlier methods. It shows how you can subtract large numbers in two steps if you are prepared to use negative numbers.

In the first step, the numbers in each column are subtracted with no borrowing at all. In the second step we resolve the problem of the "negative markers" by borrowing at that stage. This second step uses a combination of borrowing and the concepts that I shared in the floating digit subtractions.

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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.

[MrVoayer]

Sure, not exactly a method suitable to teach kids at school, in early grades, but an attractive algorithm nonetheless.Thank you for showing us there is more to subtraction than many of us thought there was !!!