Math Mistakes:

more or less CCSS aligned.

Main menu

Skip to primary content

Skip to secondary content

About
Physics Mistakes

Search

Browse by subject

Coming soon, as soon as we learn how to write the code…

Cancel Reply

About

This site is about compiling, analyzing and discussing the mathematical errors that students make. Every day a new mistake is posted. The site is edited by Michael Pershan, a high school math teacher from NYC.

Submit a mistake

To keep the site going we need lots of interesting mistakes. To submit a picture of mathematical work, email mathmistakes@gmail.com

Common Core Standards

►Grade 1 (3)
- ►Operations & Algebraic Thinking (1)
- ►Number & Operations in Base 10 (2)
  - ►1.NBT.2 (1)
- ►Measurement & Data (0)
- ►Geometry (0)
►Grade 2 (5)
- ►Operations & Algebraic Thinking (1)
  - ►2.OA.1 (1)
- ►Numbers & Operations in Base 10 (2)
- ►Measurement & Data (2)
- ►Geometry (0)
►Grade 3 (9)
- ►Operations and Algebraic Thinking (3)
  - ►3.OA.1 (2)
- ►Numbers & Operations in Base 10 (2)
- ►Numbers & Operations — Fractions (2)
  - ►3.NF.2 (2)
- ►Measurement & Data (1)
- ►Geometry (1)
►Grade 4 (8)
- ►Operations & Algebraic Thinking (0)
- ►Numbers & Operations in Base 10 (3)
- ►Numbers & Operations — Fractions (4)
- ►Measurement & Data (0)
- ►Geometry (0)
►Grade 5 (12)
- ►Operations & Algebraic Thinking (1)
- ►Numbers & Operations in Base 10 (3)
  - ►5.NBT.3 (1)
- ►Number & Operations — Fractions (5)
- ►Measurement & Data (0)
- ►Geometry (3)
►Grade 6 (17)
- ►Ratios & Proportional Relationships (2)
  - ►6.RP.3 (1)
- ►The Number System (2)
- ►Expressions & Equations (9)
- ►Geometry (3)
- ►Statistics & Probability (1)
►Grade 7 (12)
- ►Ratios & Proportional Relationships (1)
- ►The Number System (9)
- ►Expressions & Equations (1)
- ►Geometry (1)
- ►Statistics & Probability (0)
►Grade 8 (26)
- ►Expressions and Equations (21)
  - ►8.EE.7 (2)
  - ►8.EE.1 (2)
  - ►8.EE.4 (1)
- ►The Number System (2)
- ►Functions (0)
- ►Geometry (3)
- ►Statistics & Probability (0)
►High School: Number and Quantity (15)
- ►The Real Number System (5)
  - ►N-RN.2 (1)
  - ►N.RN.1 (1)
- ►Quantities* (0)
- ►The Complex Number System (7)
  - ►N.CN.2 (1)
- ►Vector and Matrix Quantities (2)
►High School: Algebra (34)
- ►Seeing Structure in Expressions (9)
  - ►A-SSE.2 (1)
- ►Arithmetic with Polynomials and Rational Expressions (10)
- ►Creating Equations* (2)
- ►Reasoning with Equations and Inequalities (13)
  - ►A-REI.1 (1)
  - ►A-REI.3 (1)
  - ►A-REI.4 (1)
►High School: Functions (52)
- ►Interpreting Functions (7)
  - ►F-IF.7 (1)
- ►Building Functions (9)
  - ►F-BF.1 (2)
- ►Linear, Quadratic, and Exponential Models* (14)
- ►Trigonometric Functions (17)
►High School: Modeling (2)
►High School: Geometry (11)
- ►Congruence (1)
  - ►G.CO.10 (1)
- ►Similarity, Right Triangles and Trigonometry (4)
  - ►G-SRT.10 (1)
- ►Circles (1)
- ►Expressing Geometric Properties with Equations (1)
  - ►G-GPE.2 (1)
- ►Geometric Measurement and Dimension (3)
- ►Modeling with Geometry (0)
►High School: Statistics and Probability (5)
- ►Interpreting Categorical and Quantitative Data (2)
- ►Making Inferences and Justifying Conclusions (0)
- ►Conditional Probability and the Rules of Probability (2)
- ►Using Probability to Make Decisions (0)

Subscribe to Blog via Email

Enter your email address to subscribe to this blog and receive notifications of new posts by email.

Join 98 other subscribers

Proudly powered by WordPress