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Dan Christensen
  • Member for 6 years, 6 months
  • Last seen more than a month ago
9 votes

Why are induction proofs so challenging for students?

7 votes

Should my 8th graders see a proof of the Pythagorean Theorem?

7 votes

Exponents with Negative Base; with or without Parentheses

4 votes

Real-life exceptions to PEMDAS?

3 votes

What are the best places online where math educators can discuss their experience?

3 votes

Inability to work with an arbitrary mathematical object

3 votes

What is a variable?

2 votes

Teaching congruent triangles non-rigorously

2 votes

How to resolve the new definition of subtraction and division seen in college algebra?

2 votes

Why do students have problems with showing that something is well-defined? How can this be improved?

2 votes

Why do no students know to change the limits of integration when doing substitutions?

1 vote

teach that $\frac10$ not defined properly

1 vote

How to explain that a negative number multiplied by a negative number is a positive number, and that $-(-x)=x$?

1 vote

Can we explain to undergraduates how points make a line?

1 vote

How to help new students accept function notation

1 vote

Good, simple examples of induction?

1 vote

Dividing by zero

1 vote

How to teach logical implication?

0 votes

How should I convince a student who proved $1=-1$

0 votes

Rigorously defining the concept of an angle for high school students

0 votes

Defining vertical tangent lines

0 votes

Functions, Domains, and Ranges in Precalculus

-1 votes

How to explain the difference between the fraction a / b and the ratio a : b?

-2 votes

Simple, elegant ways to teach the idea of what functions are for the first time

-2 votes

What is abstraction and generalization ?