Dave Marain Add us as a preferred source on Google
🔄 Data last refreshed 1 day ago
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🔒 Paid proposals held safely in escrow — released only when the work's approved.
Followers
30
Account age
3 yrs
💰 Suggested sponsorship rate
$40 – $65 / sponsored post
Estimated from audience size & typical reach — every deal is negotiable and held in SocialDB escrow.
🎁 Free analysisfor Dave Marain
📊 Post engagement
Recent posts · likes + reposts
Dec 16latest
3
Avg engagement / post
1–3
Typical post (engagement)
10%
Engagement vs followers
49/100
Variable reach
Nov 2022
On Mastodon since
Half of recent posts land between 1 and 3 likes + reposts (median 2) — reach is spiky, driven by the occasional post that pops.
🔥 Top post: How many of us as students were given this explanation for e^iπ · 12 likes + reposts
📊 Activity & format
Posting cadence
0.06 / week
A lower-frequency account — each post lands with more weight.
Content mix
Mostly text
Recent: 10 text · 2 image · 0 video.
Follower / following
0.7×
Follows 44 back. A more reciprocal / networked account.
Recent posts
View on Mastodon ↗
https://substack.com/@davemathnotations/note/c-349024381?utm_source=notes-share-action&r=e1ghh
What Is the Largest Power of 2 Hidden in 100!?
A questioning investigation from 4! to 100!—without calculating the factorials
DAVID MARAIN
7 minutes ago
Here is a question that begins with elementary arithmetic but leads somewhere much dee…
2026² = ? — without using a calculator
How could an area model for 26² help students see a way to calculate 2026²?
The goal isn't simply to obtain the answer. It's to develop the distributive property visually before introducing the algebr…
You can build the pattern for
your students but I'll jump right in…
What is the largest power of 2 that is a factor of the binomial coefficient (100,50)?
Should anyone care about this?
@mathematics@a.gup.pe @numberphile@birdsite.slashde…
For some reason I was thinking about 235711 = 7×151×223.
#math #mathematics #number
For all my identity thief
'friends', my new pin will be 71717. HAPPY 2023! 🤩
#mathematics #math #code
A Little Holiday Calc Fun For Your AP Students...
#calculus #apcalc #math #mathematics #mathchallenge
Show that the max value of f(x) = x^(1/√x) is e^(2/e)
Just my unsolicited opinions about flipped classrooms for math...
#math #mathchallenge #middleschool #mathematics
Exploration With Middle School Students...
Your thoughts...
How many positive integers less than 100 have exactly 8 distinct positive integer factors?
Solution Strategies vs Pedagogical Stra…
#math #mathed
In any integer base b, b≥2, the fraction 1/(b²-1) can be represented by 0._ _ _ _ _ _...
Fill in the blanks!
#math #calculus #infiniteseries #series
Something for your AP/Calc2 students...
1 - 1/3 + 1/5 - 1/7 +...
(a) Write this series in summation notation
(b) Explain why it converges.
(c) Using Wolfram Alpha or similar technology, calculate th…
2026² = ? — without using a calculator
How could an area model for 26² help students see a way to calculate 2026²?
The goal isn't simply to obtain the answer. It's to develop the distributive property visually before introducing the algebr…
You can build the pattern for
your students but I'll jump right in…
What is the largest power of 2 that is a factor of the binomial coefficient (100,50)?
Should anyone care about this?
@mathematics@a.gup.pe @numberphile@birdsite.slashde…
For some reason I was thinking about 235711 = 7×151×223.
#math #mathematics #number
For all my identity thief
'friends', my new pin will be 71717. HAPPY 2023! 🤩
#mathematics #math #code
A Little Holiday Calc Fun For Your AP Students...
#calculus #apcalc #math #mathematics #mathchallenge
Show that the max value of f(x) = x^(1/√x) is e^(2/e)
Just my unsolicited opinions about flipped classrooms for math...
#math #mathchallenge #middleschool #mathematics
Exploration With Middle School Students...
Your thoughts...
How many positive integers less than 100 have exactly 8 distinct positive integer factors?
Solution Strategies vs Pedagogical Stra…
#math #mathed
In any integer base b, b≥2, the fraction 1/(b²-1) can be represented by 0._ _ _ _ _ _...
Fill in the blanks!
#math #calculus #infiniteseries #series
Something for your AP/Calc2 students...
1 - 1/3 + 1/5 - 1/7 +...
(a) Write this series in summation notation
(b) Explain why it converges.
(c) Using Wolfram Alpha or similar technology, calculate th…
🐘 Community & instance
Home server
mathstodon.xyz
Their home server on the fediverse — the instance a creator picks signals the community they belong to.
On Mastodon since
Nov 2022
Joined in the Twitter-exodus wave of late 2022 — part of the migration that made Mastodon a real destination.
💡 Facts
🗓️Joined Mastodon in 2022 — 3 years ago.
👁️Averages 3 views per post.
📤Posts about 0.1× per week.
🕵️ Fake follower check
Estimated64/100
Good
Credibility score
89%
Real
Real audience
Low
Fake-follower risk
Medium
Data confidence
- Est. 89% real, active audience · Low fake-follower risk.
- Engagement (~0.1× of followers engage each post) is around typical for Mastodon.
- Established account (3+ years old).
Heuristic estimate from engagement, follower ratios, account age & growth — a screening signal, not a guarantee.
About
Retired math educator/admin but still passionate about the art/science of teaching and writing math questions to provoke the mind. NJ Math Curriculum Frameworks, author of New Jersey HS Math Contest
Area of Research: Alg/Analytic Number Theory
Blog: http://mathnotations.blogspot.com
🔀 Audience overlap
EstimatedEstimated shared audience with similar creators — useful for avoiding overlap (or doubling down) when planning a campaign.
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Frequently asked questions
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Dave Marain has 30 followers on Mastodon.
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