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  Mrs. Kelly-Grinnell's Grade 3 Class
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 Number Sense - Addition and Subtraction

Learning Goals:​​​
  • Solve problems involving the addition and subtraction of two-digit numbers, using a variety of mental strategies (e.g., to add 37 + 26, add the tens, add the ones, then combine the tens and ones, like this: 30 + 20 = 50, 7 + 6 = 13, 50 + 13 = 63)
  • Add and subtract three-digit numbers, using concrete materials, student-generated algorithms, and standard algorithms.
  • Use estimation when solving problems involving addition and subtraction, to help judge the reasonableness of a solution.
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