Serving advanced learners (and their teachers) since 2012.

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Grade 1

CCSS Math Standard: 1.NBT.6

subtract multiples of 10 in the range 10-90 from multiples of 10 in the range 10-90 (positive or zero differences), using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship between addition and subtraction; relate the strategy to a written method and explain the reasoning used

Broken Calculator: 2-Digit Subtraction Gr 1-4