Clarifications:
Essential Understandings
Concrete:
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To build fluency:
- Make a set of base ten blocks within 50.
- Add “more” to a set or “take from” or “take apart” a set.
- Recount the set to get a sum or a difference within 50.
- After repeated exposure to concrete and representational addition and subtraction, students will become flexible, efficient, and accurate with addition and subtraction facts within 50 without manipulatives.
-
To build fluency:
- Make a visual representation of a set of base ten blocks within 50.
- Add “more” to a set or “take from” or “take apart” a set.
- Recount the set to get a sum or a difference within 50.
- After repeated exposure to concrete and representational addition and subtraction, students will become flexible, efficient, and accurate with addition and subtraction facts within 50 without manipulatives or representations.
| Number: MAFS.2.NBT.2.AP.5a | Category: Access Points |
| Date Adopted or Revised: 06/14 |
Cluster:
Use place value understanding and properties of operations to add and subtract. (Major Cluster) : Clusters should not be sorted from Major to Supporting and then taught in that order. To do so would strip the coherence of the mathematical ideas and miss the opportunity to enhance the major work of the grade with the supporting clusters. |