Calculation is hindered by a lack of deep understanding of the number system; poor and inconsistent retrieval of facts, rules, and procedures; unconscious errors in perception, reasoning, speech, and writing; inefficient processing of visuospatial, directional, and sequential information; impaired ability to visualize; insufficient capacity to hold and manipulate  quantitative ideas in mind; compounding cognitive load; and overwhelmed working memory.
1.  ACTIVE MODELINGActively model concepts and problems, focus on language, reason aloud, and use a language-enhanced place value chart to hold  number information, see number relationships, and free up cognitive resources. 
2. MONITOR  A monitor points out  errors, reorients the student, and allows multiple opportunities to demonstrate and explain ideas.  (Error examples: saying one digit but writing another; copying errors; subtracting instead of adding; finding the difference between digits instead of subtracting). 
3.  1:1 PERFORMANCE The student performs individually with the instructor instead of independently or in a group.  The instructor monitors for, and corrects, unintentional dyscalculic errors and allows the student to: reason aloud; model ideas; illustrate;  stand;  work on a board; use  a  language-enhanced place value chart, math visualization apps, and tools to organize information (ex. ruler, color highlighters, erasable color pens, templates, and masking). 
4. AUTHENTIC ASSESSMENTS Instead of traditional math tests, the dyscalculic should demonstrate understanding with verbal explanations, illustrations, color-coding to organize elements and operations, avtive modeling, a language-enhanced place value chart, and appropriate math apps or tools.  Demonstrations can be live with a teacher or created independently and submitted as a video, presentation, website, PDF, illustrated study guide, or other form.
5. REMOVE TIME CONSTRAINTS, AND DISTRACTIONSA dyscalculic is quickly overwhelmed by compounding demands. Awareness of time running out, adds additional stress, and further impairs functioning.  Mask all visual stimuli to reveal only the information at hand. To aid visuospatial perception and processing, use highlighters, rulers, color ink. erasable color pens, and templates. 
6. TIME MANAGEMENTUse a silent visual timer to gauge the passage of time, and to establish periodic breaks for physical activity. Log start and stop times and keep a record of time per task to document overall performance speed and to see coorelations between conditions, strategies, and performance.
A calculator cannot mitigate unconscious errors (ex. number and sign mix-ups).  Isolate and chunk digits, triple check when reading and copying numbers. Speak numbers aloud to aid monitoring and to improve accuracy. Utilize topic-appropriate math visualization apps. 

School Accommodations

By Renee M. Newman, M.S, M.Ed., Founder, . Published February 24, 2020.

Experience to learn. Teach to Remember. 

Authentic Constructive Assessments = Students Teaching = Lasting Mastery.  This is a way for all students to achieve deep understanding of challenging concepts and lasting, readily accessible memory that is the foundation for advanced learning and effective independent performance.

Dyscalculic students struggle to keep up during instruction, fail to make essential connections, and are chronically in need of assistance. Because recall is inconsistent, they must relearn frequently. Limited processing capacity is gummed up with things that should be automatic. In addition, they unconsciously make errors in processing and production when reading, writing, reasoning, and speaking. They can’t trust their fist impressions and conclusions, and constantly must triple-check. For this reason, they default to primitive strategies like counting with fingers or dots. They have difficulty quickly making sense of directions (ex. left-right), visual-spatial information (clocks, math), and complex sequences. They easily become overwhelmed and unable to think clearly.