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Dan Christensen
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24 Answers

Votes Activity Newest
7
Exponents with Negative Base; with or without Parentheses
Feb 16 '18 at 19:15
6
Why are induction proofs so challenging for students?
Jul 13 '17 at 3:12
6
Should my 8th graders see a proof of the Pythagorean Theorem?
Mar 16 '16 at 16:55
3
What are the best places online where math educators can discuss their experience?
Mar 16 '18 at 4:26
3
What is a variable?
Mar 6 '16 at 3:45
2
Real-life exceptions to PEMDAS?
May 23 '19 at 4:21
2
Teaching congruent triangles non-rigorously
Apr 20 '18 at 2:58
2
Inability to work with an arbitrary mathematical object
Feb 14 '18 at 20:15
2
Why do no students know to change the limits of integration when doing substitutions?
Feb 9 '18 at 5:39
2
Why do students have problems with showing that something is well-defined? How can this be improved?
Dec 18 '16 at 17:05
1
Good, simple examples of induction?
Jan 30 '20 at 3:30
1
Dividing by zero
Apr 15 '20 at 14:41
1
How to help new students accept function notation
Sep 29 '19 at 4:30
1
teach that $\frac10$ not defined properly
Nov 22 '18 at 7:12
1
How to resolve the new definition of subtraction and division seen in college algebra?
Jun 2 '18 at 15:05
1
Can we explain to undergraduates how points make a line?
Dec 17 '17 at 15:09
1
How to explain that a negative number multiplied by a negative number is a positive number, and that $-(-x)=x$?
Jun 15 '16 at 15:33
0
How should I convince a student who proved $1=-1$
Mar 6 '20 at 19:27
0
Functions, Domains, and Ranges in Precalculus
Mar 29 '18 at 3:36
0
Defining vertical tangent lines
Feb 14 '16 at 20:09
0
Rigorously defining the concept of an angle for high school students
Jan 11 '16 at 18:57
-1
How to explain the difference between the fraction a / b and the ratio a : b?
Aug 27 '19 at 3:10
-2
Simple, elegant ways to teach the idea of what functions are for the first time
Jul 1 '18 at 14:30
-2
What is abstraction and generalization ?
May 2 '16 at 17:29