How can we help students own subtraction facts? In this episode Pam and Kim describe some basic strategies and then walk us through facilitating two Problem Strings to build subtraction relationships.
Talking Points:

I Have, You Need - see Episode 7 for more on I Have, You Need
Patterns in a subtraction chart
Generalizing about subtracting 9
Noticing differences of 1 or 2
Diagonal patterns of Constant Difference
Subtracting to 10 Problem String
Using Doubles Problem String

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