A Activity diagram used in UML 6/9 and SysML B Bachman diagram Booch used in software engineering Block diagram Block Definition Diagram BDD used in SysML C Carroll diagram Cartogram Catalytic cycle Chemical equation Curly arrow diagram Category theory diagrams Cause-and-effect diagram Chord diagram Circuit diagram Class diagram from UML 1/9 Collaboration diagram from UML 2.0 Communication diagram from UML 2.0 Commutative diagram Comparison diagram Component diagram from UML 3/9 Composite structure diagram from UML 2.0 Concept map Constellation diagram Context diagram Control flow diagram Contour diagram Cordier diagram Cross functional flowchart D Data model diagram Data flow diagram Data structure diagram Dendrogram Dependency diagram Deployment diagram from UML 9/9 Dot and cross diagram Double bubble map used in education Drakon-chart E Entity-Relationship diagram ERD Event-driven process chain Euler diagram Eye diagram a diagram of a received telecommunications signal Express-G Extended Functional Flow Block Diagram EFFBD F Family tree Feynman diagram Flow chart Flow process chart Flow diagram Fusion diagram Free body diagram G Gantt chart shows the timing of tasks or activities used in project management Grotrian diagram Goodman diagram shows the fatigue data example: for a wind turbine blades H Hasse diagram HIPO diagram I Internal Block Diagram IBD used in SysML IDEF0 IDEF1 entity relations Interaction overview diagram from UML Ishikawa diagram J Jackson diagram K Karnaugh map Kinematic diagram L Ladder diagram Line of balance Link grammar diagram M Martin ERD Message Sequence Chart Mind map used for learning, brainstorming, memory, visual thinking and problem solving Minkowski spacetime diagram Molecular orbital diagram N N2 Nassi Shneiderman diagram or structogram a representation for structured programming Nomogram Network diagram O Object diagram from UML 2/9 Organigram Onion diagram also known as "stacked Venn diagram" P Package diagram from UML 4/9 and SysML Parametric diagram from SysML PERT Petri net shows the structure of a distributed system as a directed bipartite graph with annotations Phylogenetic tree - represents a phylogeny evolutionary relationships among groups of organisms Piping and instrumentation diagram P&ID Phase diagram used to present solid/liquid/gas information Plant Diagram Pressure volume diagram used to analyse engines Pourbaix diagram Process flow diagram or PFD used in chemical engineering Program structure diagram R Radar chart Radial Diagram Requirement Diagram Used in SysML Rich Picture R-diagram Routing diagram S Sankey diagram represents material, energy or cost flows with quantity proportional arrows in a process network. Sentence diagram represents the grammatical structure of a natural language sentence. Sequence diagram from UML 8/9 and SysML SDL/GR diagram Specification and Description Language. SDL is a formal language used in computer science. Smith chart Spider chart Spray diagram SSADM Structured Systems Analysis and Design Methodology used in software engineering Star chart/Celestial sphere State diagram are used for state machines in software engineering from UML 7/9 Swim lane Syntax diagram used in software engineering to represent a context-free grammar Systems Biology Graphical Notation a graphical notation used in diagrams of biochemical and cellular processes studied in Systems biology System context diagram System structure Systematic layout planning T Timing Diagram: Digital Timing Diagram Timing Diagram: UML 2.0 TQM Diagram Treemap U UML diagram Unified Modeling Language used in software engineering Use case diagram from UML 5/9 and SysML V Value Stream Mapping Venn diagram Voronoi diagram W Warnier-Orr Williot diagram Y Yourdon-Coad see Edward Yourdon, used in software engineering
The MATHCOUNTS Foundation is a 501 (c) (3) non profit organization that reaches students in grades 6 8 in all US states and territories with 2 extracurricular math programs.
MathCounts, stylized as MATHCOUNTS, is a nonprofit organization that provides grades 6 through 8 extracurricular mathematics programs in all U.S. states, plus the District of Columbia, Puerto Rico, Guam, the U.S. Virgin Islands, and Department of Defense schools.
Plan for the 2026 MATHCOUNTS season with confidence: format, levels, timeline, prep strategies, skill breakdown, and free resources — all in one guide.
Sponsored by the CNA Foundation, National Society of Professional Engineers, the National Council of Teachers of Mathematics, AoPS and others, the focus of MATHCOUNTS is on mathematical problem solving. Students are eligible for up to three years, but cannot compete beyond their eighth grade year.
The MATHCOUNTS mission: To increase interest and involvement in mathematics among all middle school students in order to assist in developing a technically literate population essential to U.S. global competitiveness and the quality of life.
MATHCOUNTS is a national math coaching and competition program for 6th, 7th, and 8th grade students. The program is run by the MATHCOUNTS Foundation, state and local chapters of the NSPE, and many, many volunteers. Participation in the program is through your school.
All you need to know about MATHCOUNTS contest from School, Chapter, State, and National level. This page includes resources and tips to excel in the contest.
What Is MATHCOUNTS? MATHCOUNTS is a nationwide math competition for middle school students (grades 6 through 8), and it gives you the chance to solve challenging problems, build teamwork skills, and compete at multiple levels all the way up to the national stage.
The top 4 individuals from each state (including NSCs) receive an all expenses paid trip to the RTX MATHCOUNTS National petition. These 224 competitors form 4 person state teams, plus compete individually for the title of National Champion.
MATHCOUNTS Trainer delivers MATHCOUNTS problems to you one at a time. Start at the School round and advance by unlocking Chapter, State, and National rounds.
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