Basic Subtraction

Learning to subtract 2 digits numbers by 1 digit numbers, by counting down.

Mapped to CCSS Section# 2.NBT.B.5, 2.OA.A.1

Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.,Use addition and subtraction within 100 to solve one- and two-step word problems involving situations of adding to, taking from, putting together, taking apart, and comparing, with unknowns in all positions, e.g., by using drawings and equations with a symbol for the unknown number to represent the problem.
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