Clarifications:
Essential Understandings
Concrete:
- Given an addition problem, a number line and counters, place a counter on the first addend, and move the counter forward the number of units indicated by the second addend, to find the sum, within 100.
- Given a subtraction problem, a number line, and counters, locate the first number, and move backwards the number of units indicated by the second number, to find the difference, within 100.
- Given an addition problem and a number line, locate the first addend, and move the forward the number of units indicated by the second addend, to find the sum, within 100.
- Given a subtraction problem and a number line, locate the first number, and move backwards the number of units indicated by the second number, to find the difference, within 100.
- Understand the following concepts and vocabulary of number line, addition (+), subtraction (-), forward, backward.
| Number: MAFS.2.MD.2.AP.6a | Category: Access Points |
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Cluster:
Relate addition and subtraction to length. (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. |