Clarifications:
Essential Understandings
Concrete:
- Count backwards from 19 objects to 0 objects.
- Using objects, begin with less than 20 objects and remove a specified number of objects while counting backwards.
- Using a number line, begin with a number less than 20 and count backwards a specified number of times to subtract the number.
- Understand the following concept and vocabulary of take away, take from, take apart, separate, etc.
| Number: MAFS.1.OA.3.AP.5b | Category: Access Points |
|
Cluster:
Add and subtract within 20. (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. |