Math Mistakes

Main menu

Skip to primary content
Skip to secondary content
  • About
  • Random Post

“0.5 goes into five 8 times…”

Posted on December 17, 2013 by mpershan | 6 Replies

Avery (1024x456)

 

I’m stumped. Ideas?

(Thanks to Avery for the submission!)

Share this:

  • Email
  • Print
Posted in Fractions, Number & Operations -- Fractions.

Post navigation

Next Post → ← Previous Post

About

This site is about compiling, analyzing and discussing the mathematical errors that students make. The site is edited by Michael Pershan, a middle school and 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 michael@mathmistakes.org.

Random Mistake!

Get a random post.

Categories

  • ▼Elementary School (114)
    • Fractions (32)
    • Decimals (12)
    • Multiplication (20)
    • Place Value (6)
    • Subtraction (10)
    • Patterns (2)
    • Counting (2)
    • Addition (5)
    • ►Geometry (8)
      • Midpoint (0)
    • Money (2)
    • Division (5)
    • Data (1)
    • Equality (1)
    • Area (1)
  • ►Geometry (58)
    • Isosceles Triangles (2)
    • Quadrilaterals (4)
    • Proofs (4)
    • Pythagorean Theorem (10)
    • Circles (1)
    • Similar Figures (7)
    • Right Triangles (6)
    • Equations of Parallel and Perpendicular Lines (2)
    • Distance Between Points (2)
    • Vertical Angles (1)
    • Algebra in Geometry (1)
    • Area (5)
    • Surface Area and Volume (1)
    • Midpoint (1)
    • Congruent Triangles (1)
    • Transformations (1)
  • ►Middle School (34)
    • Rates (3)
    • Converting Units (2)
    • Decimals (3)
    • Area (3)
    • Perimeter and Volume (3)
    • Exponents (5)
    • Rounding (1)
    • Expressions (1)
    • Geometry (1)
    • Square Roots (2)
    • Fractions (4)
    • Negative Numbers (2)
  • ►Algebra 1 (177)
    • exponents (26)
    • factoring (7)
    • ►linear functions (18)
      • horizontal and vertical lines (1)
      • slope (7)
    • Quadratics (8)
    • Radicals (5)
    • Solving Linear Equations (19)
    • Quadratic Functions (3)
    • Scientific Notation (2)
    • Graphing (9)
    • Simplifying expressions (4)
    • Negative Numbers (11)
    • Rational Expressions (7)
    • Solving Linear Inequalities (2)
    • Arithmetic (3)
    • Distributive Property (11)
    • ►Expressions (16)
      • Multiplying Polynomials (5)
    • Ratios and Proportions (7)
    • Solving for a Variable (1)
    • Systems of Equations (3)
    • Visual Patterns (1)
    • Naming Coordinates (1)
  • ►Algebra 2 (57)
    • ►Functions (11)
      • Inverses (2)
    • logarithms (6)
    • Rational Expressions (3)
    • Radicals (1)
    • Quadratic Functions (4)
    • Complex Numbers (9)
    • Solving Trig Equations (1)
    • Vectors and Matrices (2)
    • Absolute Value (3)
    • Systems of Equations (2)
    • Exponents (3)
    • Series (4)
    • Rational Functions (1)
    • Exponential Functions (2)
    • Sequences and Series (1)
  • ►Trigonometry (29)
    • Law of Cosines (1)
    • Law of Sines (4)
    • Solving Trig Equations (0)
    • Trig Identities (12)
    • Inverse Trig Functions (1)
    • Arc Length (1)
    • Exact Values of Trig Functions (4)
    • Graphing Trig Functions (1)
  • ►Calculus (16)
    • Limits (3)
    • Derivatives (5)
    • Max/Min Problems (1)
    • Rates of change (1)
    • Tangent Lines (1)
    • Integration (1)
    • Infinite Series (1)

Common Core Standards

  • ►Grade 1 (5)
    • ►Geometry (0)
    • ►Measurement & Data (1)
    • ►Number & Operations in Base 10 (3)
      • ►1.NBT.2 (1)
    • ►Operations & Algebraic Thinking (1)
  • ►Grade 2 (5)
    • ►Geometry (0)
    • ►Measurement & Data (2)
    • ►Numbers & Operations in Base 10 (2)
    • ►Operations & Algebraic Thinking (1)
      • ►2.OA.1 (1)
  • ►Grade 3 (26)
    • ►Geometry (4)
    • ►Measurement & Data (1)
    • ►Numbers & Operations — Fractions (6)
      • ►3.NF.2 (2)
    • ►Numbers & Operations in Base 10 (9)
    • ►Operations and Algebraic Thinking (4)
      • ►3.OA.1 (2)
  • ►Grade 4 (53)
    • ►Geometry (4)
    • ►Measurement & Data (4)
    • ►Numbers & Operations — Fractions (13)
    • ►Numbers & Operations in Base 10 (25)
    • ►Operations & Algebraic Thinking (2)
  • ▼Grade 5 (27)
    • ►Geometry (4)
    • ►Measurement & Data (1)
    • ▼Number & Operations — Fractions (13)
      • "0.5 goes into five 8 times..."
      • 2/3 as a "2 by 3"
      • 3/7 = 10/14 and 1/2 = 3/14
      • Classic Mistakes: Adding Fractions
      • Division by 1/4
      • Fractions Mistakes In The Wild
      • Maybe they were adding?
      • Mixed-Up Numbers
      • Sometimes Kids Add When They're Trying To Multiply
      • Subtracting Fractions
      • The Distributive Property of Fractions
      • Using Subtraction to Divide Fractions
      • Whole numbers and 1
    • ►Numbers & Operations in Base 10 (8)
      • ►5.NBT.3 (1)
    • ►Operations & Algebraic Thinking (1)
  • ►Grade 6 (22)
    • ►Expressions & Equations (10)
    • ►Geometry (3)
    • ►Ratios & Proportional Relationships (5)
      • ►6.RP.3 (1)
    • ►Statistics & Probability (1)
    • ►The Number System (3)
  • ►Grade 7 (23)
    • ►Expressions & Equations (5)
    • ►Geometry (2)
    • ►Ratios & Proportional Relationships (3)
    • ►Statistics & Probability (0)
    • ►The Number System (13)
  • ►Grade 8 (42)
    • ►Expressions and Equations (33)
      • ►8.EE.1 (2)
      • ►8.EE.4 (1)
      • ►8.EE.7 (2)
    • ►Functions (1)
    • ►Geometry (3)
    • ►Statistics & Probability (2)
    • ►The Number System (3)
  • ►High School: Algebra (49)
    • ►Arithmetic with Polynomials and Rational Expressions (11)
    • ►Creating Equations* (4)
    • ►Reasoning with Equations and Inequalities (19)
      • ►A-REI.1 (1)
      • ►A-REI.3 (1)
      • ►A-REI.4 (1)
    • ►Seeing Structure in Expressions (14)
      • ►A-SSE.2 (1)
  • ►High School: Functions (72)
    • ►Building Functions (12)
      • ►F-BF.1 (2)
    • ►Interpreting Functions (9)
      • ►F-IF.7 (1)
    • ►Linear, Quadratic, and Exponential Models* (20)
    • ►Trigonometric Functions (25)
  • ►High School: Geometry (46)
    • ►Circles (2)
    • ►Congruence (6)
      • ►G.CO.10 (1)
    • ►Expressing Geometric Properties with Equations (5)
      • ►G-GPE.2 (1)
    • ►Geometric Measurement and Dimension (13)
    • ►Modeling with Geometry (0)
    • ►Similarity, Right Triangles and Trigonometry (16)
      • ►G-SRT.10 (1)
  • ►High School: Modeling (2)
  • ►High School: Number and Quantity (20)
    • ►Quantities* (0)
    • ►The Complex Number System (9)
      • ►N.CN.2 (1)
    • ►The Real Number System (7)
      • ►N-RN.2 (1)
      • ►N.RN.1 (1)
    • ►Vector and Matrix Quantities (3)
  • ►High School: Statistics and Probability (12)
    • ►Conditional Probability and the Rules of Probability (6)
    • ►Interpreting Categorical and Quantitative Data (3)
    • ►Making Inferences and Justifying Conclusions (0)
    • ►Using Probability to Make Decisions (0)

Archives

  • RSS - Posts
  • RSS - Comments

Subscribe to Blog via Email

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

Join 309 other subscribers

Creative Commons License
This work is licensed under a Creative Commons Attribution 3.0 Unported License.
© 2019 Math Mistakes, all rights reserved.
Proudly powered by WordPress
loading Cancel
Post was not sent - check your email addresses!
Email check failed, please try again
Sorry, your blog cannot share posts by email.