Clarifications:
Essential Understandings
Concrete:
- Make a set of objects.
- Add “more” to a set.
- Count to find the sum.
- Take away the set that was added to the original set to show that subtraction is the opposite of addition. (Ex: 8 red counters + 2 blue counters = 10 counters; 10 counters – 2 blue counters = 8 red counters).
- Make a set of visuals.
- Add “more” to a set of visuals.
- Count to find the sum.
- Take away the set of visuals that was added to the original set to show that subtraction is the opposite of addition.
- Identify pairs of equations that identify subtraction as the inverse of addition (e.g., match 2 + 6 = 8 with 8 – 6 = 2).
| Number: MAFS.1.OA.2.AP.4a | Category: Access Points |
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Cluster:
Understand and apply properties of operations and the relationship between addition and subtraction. (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. |