Let's think about the difference between subtracting 1 and subtracting 10.
Subtracting 1 or 10 is a free educational video by Khan Academy.It helps students in grades 2 practice the following standards 2.NBT.B.5.
1. 2.NBT.B.5 : Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction..
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