Unit 8 Topic 4A: Adding and Subtracting with 2-Digit Numbers

                      Curriculum & Pacing             Topic 1              Topic 2              Topic 3              Topic 4
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4A.1 How Many Cubes?
  • Counting by groups of 10s
  • Using a number to represent a set of objects
  • Comparing two two-digit numbers and using notation (>, <) to record the results of the comparison
​4A.2 Adding and Subtracting 10
  • Using objects to represent a number
  • Adding and subtracting 10 to/from two-digit numbers
​4A.3 Adding with Cubes
  • Using cubes in tens and ones to represent a two-digit number
  • Adding a one-digit number or 10 to a two-digit number
  • Adding a multiple of 10 to a two-digit number
4A.4 How Many Now?
  • Using cubes in tens and ones to represent a two-digit number
  • Subtracting a multiple of 10 from a multiple of 10
4A.5 Assessment: Adding and Subtracting
  • Using a number to represent a set of objects (and vice versa)
  • Adding and subtracting 10 to/from a two-digit number
  • Adding a one-digit number, or a multiple of 10, to a two-digit number
  • Subtracting a multiple of 10 from a multiple of 10
  • Discussing addition problems that involve regrouping in the ones place