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 General Purpose and Special Purpose Tools
 Walter Warwick Sawyer, 19112008
 Math in the Comics  part 9
 Relationships  Percentages
 Quantity  Different Kinds of Numbers: Vectors
 Groupings, Shopping Lists, Vectors: part 1
 Groupings, Shopping Lists, Vectors: part 2
 Groupings, Shopping lists, Vectors: part 3
 Notes on Representation  Tally Marks, Tully Marks

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Monthly Archives: December 2009
Groupings, Shopping Lists, Vectors: part 9
In earlier parts of this series we’ve looked at shopping lists as both an example and a model for something that in math class is called a vector. We’ve looked at the sum of two vectors by imagining you join … Continue reading
Posted in Uncategorized
Tagged denominations, extending patterns, math class, models, naming, representations, whole vs. parts
1 Comment
Groupings, Shopping Lists, Vectors: part 8
In part 7 of this series, one of the examples for the use of inner product of two vectors was that of a final score based on a series of tests with different weights. We have a vector of weights … Continue reading
Posted in Uncategorized
Tagged denominations, extending patterns, models, naming, representations, whole vs. parts
2 Comments
Groupings, Shopping Lists, Vectors: part 7
In part 6 of this series, I introduced an operation called inner product between two vectors, as a way to find the total price of an order using a price list. In this post, I want to give a bunch … Continue reading
Posted in Uncategorized
Tagged denominations, lookup, math class, models, naming, representations, whole vs. parts
2 Comments
Groupings, Shopping Lists, Vectors: part 6
In this series on vectors we showed vector addition in this post, and then took a small excursion to show a surprising connection between some vector additions and the distributive property. In this post, I will combine vectors with lookup … Continue reading
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Tagged denominations, lookup, naming, representations, whole vs. parts
4 Comments
Groupings, Shopping Lists, Vectors: part 5
In the previous post, I introduced vector addition in terms of combining two piles of stuff, while keeping track of what kind of stuff is in our piles, and how many of each of the stuff we’ve got. In this … Continue reading
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Tagged education, math class, models, representations, whole vs. parts
2 Comments
Groupings, Shopping Lists, Vectors: part 4
Part 1, part 2, and part 3 of this series looked at a particular model for vector algebra, based on some simple notions such as that of a shopping list. In this post, I want to play with vector addition … Continue reading
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Tagged denominations, models, naming, representations, whole vs. parts
3 Comments
Groupings, Shopping lists, Vectors: part 3
The previous installments in this series can be found here and here. What I am after is a natural way to develop the usefulness of the idea of a vector, and in the previous post I suggested that a shopping … Continue reading
Posted in Uncategorized
Tagged denominations, math class, models, naming, representations, whole vs. parts
2 Comments