Content Analysis: Subtraction with the make a ten strategy
MathABC.com: Subtraction: Make a problem out of these pictures
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MathABC.com: Subtraction: Balance the equation
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MathABC.com: Subtracting up to 100
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MathABC.com: Subtracting up to 50
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MathABC.com: Subtracting up to 10 with images and numbers
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MathABC.com: Subtraction: Calculations: subtracting - up to 50
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MathABC.com: Subtraction: Calculations: subtracting - up to 20
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Subtraction with the make a ten strategy
Subtraction with the make a ten strategy
MathABC.com: Subtracting up to 5 with images
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MathABC.com: Subtraction: Subtracting up to 50 (multiple choice)
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MathABC.com: Subtraction: Subtracting up to 200 (multiple choice)
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MathABC.com: Calculations: subtracting - up to 500
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MathABC.com: Subtraction: How many images are you left with? (up to 5)
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