Robert Inzalaco Elaine Clark Jamie Lahey

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Presentation transcript:

Robert Inzalaco Elaine Clark Jamie Lahey Problem: 300-279 Robert Inzalaco Elaine Clark Jamie Lahey

Content Standards 3.N.4: Understand the place value structure of the base ten number system. 3.N.5: Use a variety of strategies to compose and decompose three-digit numbers 3.N.18: Use a variety of strategies to add and subtract three-digit numbers (with and without regrouping)

Process Standards 3.PS.2: Understand that some ways of representing a problem are more helpful than others. 3.CN.4: Understand multiple representations and how they are related. 3.R.1: Use verbal and written language, physical models, drawing charts, graphs, tables, symbols, and equations as representations 3.CM. 7: Listen for understanding of mathematical solutions shared by other students.

Our first strategy… Compensation 300-279=? 300-1=299 279-1=278 299-278= 21

Our second strategy… Counting Up 300-279=? 279+1=280 280+10=290 290+10=300 10+10+1= 21

Our Third Strategy… Take Away 300-279=? 300-200=100 100-80=20 79+1=80 20+1= 21