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For questions about teaching mathematics in secondary education (in most countries approx. ages 10-18).

4 votes

Teaching students to write the "invisible" ones

I see this as two separate questions: 1) Are there any downsides? 2) Should I condone it for my students? 1) As mentioned in other answers, it can make the transition into deeper areas more difficu …
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1 vote

High school level activities to decrease reliance on calculators?

A general anti-calculator strategy is to give the students the answer and then adjust your questioning accordingly. Suppose you were teaching multiplication and was trying to get them to do $23\time …
Karl's user avatar
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8 votes
3 answers
2k views

How to Teach Averages (Arithmetic Mean) to a Teenager?

Suppose you had to teach averages to a teenager. For arguments sake let the question be; Find the mean of $2, 3, 4, 7$ Of course the simple answer is $\frac{2+3+4+7}{4}=4$ but in my experience the …
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13 votes

Introduction to Topology for 11 year olds

You could explore maps such as the London Underground where the actual distance and locations of stops are unimportant only their relationships. Perhaps this could be turned to a practical lesson some …
Karl's user avatar
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11 votes
1 answer
390 views

Solving linear equations by factoring

I usually teach solving linear equations by balancing both sides e.g. $$\begin{array}{cccc} 2x&+&3&=&5\\ &&\color{red}{-3}&&\color{red}{-3}\\ 2x&&&=&2\\ \color{red}{\div2}&&&&\color{red}{\div2}\\x&&& …
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1 vote

Motivation for Exponent Rules

I let the students discover the rules for exponentiation as a consequence of finding prime factors. Students like the shorthand notation $24=2\times2\times2\times3=2^3\times3$ and related questions ar …
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14 votes
1 answer
194 views

Resources suitable for a beginners' course with exponentials

I'm currently involved in developing materials for a new UK tier of examination known as Core Maths. The course is designed for 16-18 year olds to further their mathematics education but without taki …
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1 vote

Simpler explanation for finding the vertex of a parabola

Consider $f(x)=x^2$ then $f(x-a)+b=(x-a)^2+b$ and geometrically corresponds to translating the graph of $y=f(x)$ by a vector $[a,b]^T$ In particular the vertex $(0,0) \mapsto (a,b)$ Cases such as $k …
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2 votes

What are some common fallacies students make when they learn $X$ concept?

I think in part you answered your own question. Students make these mistakes because they seem logical. What 'seems logical' to a student will be the product of a host of factors such as age, maturity …
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2 votes

Tips for teaching A-level Maths/Further Maths students

Here's how I would have attempted the lesson. First I would have given the students various cards such as: $\sin(A+B)=\sin A+\sin B$ $\sin(A+B)=\sin A \cos B + \sin B \cos A$ $\sin(A+B)=\sin(B+A) …
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