1.NBT.6.Subtract+multiples+of+10+...

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Number and Operations in Base Ten 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.
 * Use place value understanding and properties of operations to add and subtract. **
 * TM 1.7.3, 1.7.4 ||