This screencast shows two examples of using a rekenrek to subtract.
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Division Strategy 3 Fair Share 3,4,6
Division Strategy 5 Fair Share 7,8,9
Division Strategy 2 Think Multiplication x2,10,5,1
Division Strategy 4 Think Multiplication x3,4,6
Division Strategy 6 Think Multiplication x7,8,9
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Division Strategy 1 Fair Share 2,10,5,1
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Subtraction Strategy 1 Count Back 1,2,3
Subtraction Strategy 5 Think Addition Sums to 10, Part 2
Subtraction Strategy 6 Think Addition Sums Greater than 10
Subtraction Strategy 2 Back Down Thru 10 2,3,4,5,6
Subtraction Strategy 3 Build Up Thru 10 7,8,9
Subtraction Strategy 4 Think Addition Sums to 10, Part 1
Addition Strategy 1 Count On +1,2,3
Addition Strategy 4 Make 10 & More +7,8,9
Addition Strategy 2 Doubles & Near Doubles
Addition Strategy 3 Make 10