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Subtraction without Regrouping

Learning to subtract 2 digits numbers by 2 digit numbers, without regrouping.

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

Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.,Fluently add and subtract within 20 using mental strategies.2 By end of Grade 2, know from memory all sums of two one-digit numbers.
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