Topic 11 Week 27 Feb. 27 , 2019
Topic 11 MAFS.1.NBT.3.6 (DOK 2) 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. [Conceptual Understanding] · Identify the value of each digit of a number within 100. · Use concrete models or drawings to subtract multiplives of 10 in the range of 10-90 from multiples of 10 in the range of 10-90 (positive or zero differences). · Choose an appropriate strategy (based on place value, properties of operations, and/or the relationships between addition and subtraction) for solving subtraction problems with multiples of 10. · Relate the chosen strategy to a written method (equation) and explain the reasoning used
I Do! Use addition to solve each subtraction problem. 60 – 30 = _______.
We Do! 70 + _______ = 90, so 90 – 70 = _______.
You Do! 52 – ___ = 22 so 22 + ___ = 52 64 - _____ = 44 so 44 + ____ = 64 86 - _____ = 26 so 26 + _____ = 86