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City of Willoughby, Sydney, New South Wales

Coding and AI classes in Willoughby

How do Willoughby families choose the best coding and AI classes?

Look for live teaching, small groups by level, and real projects. Our online classes run from Scratch for six-year-olds to Python, data and AI for teenagers and adults. The City of Willoughby, about 22 square kilometres, had 75,613 residents in the 2021 Census, and 51.0% of its families were couples with children.

Chatswood station logged 805,797 Opal entries in October 2024 and 949,108 in August 2026. Add up the 22 month-to-month percentage changes in between and you get 21.75%. The real growth is 17.79%. Nothing is wrong with the data; percentages simply do not add. Switch to log differences and the 22 changes sum to 0.16369, which turns back into exactly 17.79%. At St Leonards the same mistake even flips the sign.

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Facts last verified 10 October 2026. Teaching is online; no Willoughby branch is claimed.

Course picks for Willoughby

Courses for numerate learners of every age

All four courses reach the Chatswood growth project at some point. The trial lesson confirms the right one, without asking for payment details.

Maths Through Coding course thumbnail
Ages 10 to 15

Maths Through Coding

Percentages, ratios and growth turned into code a learner can test.

See the syllabus
 Data Science for Teens course thumbnail
Ages 13 to 17

Data Science for Teens

Python with real data files: cleaning, charting and summarising change.

See the syllabus
 AI and Machine Learning for Teens course thumbnail
Ages 14 to 17

AI and Machine Learning for Teens

How models learn from data, including why many use logs of growing quantities.

See the syllabus
 Data Analysis Course course thumbnail
University and adult

Data Analysis Course

Analysis for study and work, with growth rates reported correctly.

See the syllabus

Browse the course atlas for more than one hundred options and use the coding roadmap to check prerequisites.

The four we are known for

Python, AI, vibe coding and agentic coding

These run underneath everything above. Every one is live and online, placed by ability rather than by age, and the first class is free.

Vibe Coding for Teens course thumbnail
Vibe codingAges 13 to 17

Vibe Coding for Teens

Python, web and AI projects where the learner still owns the thinking.

See the syllabus
 Python Automation Course course thumbnail
Python and AICollege and adult

Python Automation Course

Automate the work you already do, then let AI carry part of it.

See the syllabus
 AI and Machine Learning for Teens course thumbnail
AI and MLAges 14 to 18

AI and Machine Learning for Teens

Train a model, read what it learned, and be able to say why it is wrong.

See the syllabus
 Codex & Claude Code course thumbnail
Agentic codingProfessionals

Codex & Claude Code

Run AI coding agents on real work without losing control of the codebase.

See the syllabus
Willoughby in the 2021 Census

Families with children, apartments and houses side by side

From the statistics bureau's QuickStats for the Willoughby local government area, compared with New South Wales and Australia.

City of Willoughby headline counts
MeasureValue
Residents75,613
Families20,701
All private dwellings31,141
Average household size2.6 people
Council areaAbout 22 square kilometres
Willoughby beside the state and the country
IndicatorWilloughbyNSWAustralia
Couple families with children51.0% (10,550)44.7%43.7%
Separate houses among occupied homes44.7% (12,337)65.6%72.3%
Bachelor degree or higher53.1% (32,588)27.8%26.3%
Professionals among employed residents41.4% (15,460)25.8%24.0%
Children aged 5 to 96.9% (5,182)6.2%6.2%

A near even split

Flats or apartments are 47.1% of occupied homes and separate houses 44.7%, with townhouses and terraces making up 7.8%.

Young families

Half of Willoughby's families are couples with children, and children aged 5 to 9 are a larger share of residents than across the state.

Degrees and professions

More than half of residents hold a bachelor degree or higher, and managers add 20.7% of workers to the 41.4% who are professionals.

Census counts are slightly randomised to protect privacy, so table rows may not match totals exactly. We quote each figure as the bureau published it and never construct a total from its parts.

Signature project

Why Chatswood's monthly percentages add up to the wrong answer

Transport for NSW publishes Opal entries for every station each month. On our location check three stations fall inside the Willoughby boundary, and their 23 months make a clean lesson in growth arithmetic.

Adding monthly changes vs the true change, October 2024 to August 2026 (our calculation)
StationEntries, Oct 2024Entries, Aug 2026Sum of monthly % changesTrue change
Chatswood805,797949,108+21.75%+17.79%
Artarmon102,749103,516+11.62%+0.75%
St Leonards263,333257,822+10.65%-2.09%
Two Chatswood months in both measures
MonthEntriesPercentage changeLog difference x 100
January 2025686,889-9.12-9.56
February 2025776,344+13.02+12.24

Why percentages drift

A fall of 9.12% followed by a rise of 13.02% looks like +3.9 in total, but the rise is measured from a smaller base. Over 22 months these small errors pile up in one direction.

Why logs behave

The log difference ln(new / old) for each month adds exactly: the 22 Chatswood values sum to 0.16369, the same as ln(949,108 / 805,797).

Back to a percentage

exp(0.16369) minus 1 is 0.1779, so the log route returns the true 17.79% growth with no correction needed.

The St Leonards trap

Entries at St Leonards fell from 263,333 to 257,822, a drop of 2.09%. Yet the monthly percentage changes sum to +10.65%. A report built by adding them would say the station grew when it shrank. Summing log differences gives -0.02115, which converts back to the correct -2.09%.

The same idea explains averages: Chatswood's simple mean monthly change is 0.989%, while the steady monthly rate that reproduces the real growth is 0.747%. Entries are Opal gate taps rather than people, Chatswood appears in the file with the station type "Metro Shared", and every percentage and log value here is our own calculation from the published counts.

Beyond the project

Where log thinking turns up next

Once learners trust log differences on station data, the same tool appears all over programming, maths and AI.

Follow-on exercises
ExerciseCode or mathsIdea it unlocks
Chart Chatswood on a log scalematplotlib with a log y-axisEqual steps mean equal percentage growth
Compound growth of savingsA loop compared with the formulaWhy repeated percentages multiply
Model loss in machine learningLog loss for a simple classifierWhy AI training uses logarithms
Growth of three stationsOne function, three seriesFair comparison of big and small numbers

Upper primary

Explore with a calculator: a 50% fall then a 50% rise does not return to the start. Then try it in Scratch.

High school

Write the Chatswood comparison in Python and link it to logarithms in the NSW Mathematics syllabus.

Adults

Fix growth reports at work that add monthly percentages, and present compound rates that reconcile with totals.

Transport for NSW, the statistics bureau and the education department published the open data used here; they have no connection with us, and the calculations are our own.

Willoughby schools

Eleven public schools, the oldest from 1863

From the education department's government school location file.

The school count

Eleven government schools sit in the City of Willoughby in the master dataset: six primary schools, three secondary schools and two schools for specific purposes.

Early first teachers

Willoughby Public School records a first teacher in 1863, Chatswood Public School in 1883 and Artarmon Public School in 1910.

More recent openings

Chatswood High School dates from 1959, Bradfield College from 1993 and Naremburn School from 2001.

NSW school year 2027

Eastern division students return for Term 1 on Wednesday 3 February 2027; summer holidays run from Friday 18 December 2026 to Wednesday 27 January 2027.

Learning ladder

From counting clicks in Scratch to modelling growth in Python

A guide only; the free trial lesson decides where each learner starts.

Ages 6 to 10

Scratch and counting

Games with scores, timers and simple variables, where numbers first become code.

Scratch Coding for KidsVibe Coding for Kids
Ages 10 to 14

Maths in code

Percentages, ratios and patterns tested in Python, building number sense for high school.

Maths Through CodingPython and AI for Kids
Ages 14 to 18

Data and AI

Real data files, growth rates, charts and first machine learning models.

Data Science for TeensAI and Machine Learning for Teens
University and adult

Analysis that holds up

Statistics, data pipelines and AI systems built on sound arithmetic.

Data Analysis CourseStatistics & Probability
Coding and AI

Can a Willoughby learner trust an AI to calculate growth?

Only after learning to check it, which is what this page's project trains.

Ask a chatbot for the total growth across a table of monthly percentages and it may add them, exactly the mistake that turns St Leonards' fall into a rise. The answer arrives with confident wording and tidy formatting, and nothing in it flags the error.

A learner who has run the Chatswood comparison knows the sum should match ln(last / first), and can test any AI answer in one line of Python. That habit of checking a result against a simple identity is what separates using AI from being misled by it.

In 2026 AI can produce the report; a Willoughby learner who knows why percentages do not add is the one who spots when the report is wrong. The longer argument is in why teenagers should still learn to code in 2026.

Delivery

Online classes that fit a Willoughby week

Classes come to the learner on a laptop, wherever they are in the council area, from Castle Cove to Naremburn.

Taught live

A real teacher on video reads the learner's code as it is typed and explains each correction.

In step with NSW

Lessons use NSW stage and syllabus language, and the timetable breaks for state school holidays.

Start with a free lesson

The first full lesson costs nothing; the teacher then suggests a course, level and regular time.

Matched groups

Fifteen to twenty learners working at one level, or one-to-one teaching if that suits better.

A steady rhythm

Two lessons a week at a set time, about eight a month, with holidays planned ahead.

Teachers in India

A 4pm Willoughby lesson during daylight saving starts at 10:30am India time, and at 11:30am once Sydney returns to standard time.

Sydney daylight saving

Clocks in Sydney go forward on Sunday 4 October 2026 and back on Sunday 4 April 2027. India keeps one time all year, so our teachers' offset shifts twice a year; every time we quote is in Sydney time.

Fees

Fees for Willoughby learners

Clear prices that do not change by course.

First classUSD 0

A complete first lesson free, followed by a suggested course, level and time.

Group tuitionUSD 100

Group learning for a month, normally eight lessons, fifteen to twenty learners at one level.

Private tuitionUSD 150

One teacher and one learner, around eight lessons a month.

Invoices for families outside India are in US dollars, so Artarmon and Northbridge households pay the same. Payment follows the trial only once a course and time are agreed, and the pricing page explains breaks, missed lessons and changes of format.

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Reviews

Google reviews from our families

Rated 4.9 across 547 Google reviews. These are real reviews, reproduced as written.

★★★★★

"The one step solution for my son. Modern Age Coders make learning coding so simple that kids love it. The teachers explain complex concepts clearly with practical exercises and interactive content."

Ria Mukherjee

Parent

★★★★★

"Modern Age Coders has been a game-changer for me. I struggled to grasp IT concepts and coding before joining, but their classes transformed everything. I can now confidently write complex programs with ease."

Samriddha Mondal

Student

★★★★★

"One of the most wonderful education centres out there. Education is not limited to school syllabus but focuses on skill development."

Vansh Agarwal

Student

★★★★★

"My child Dhairya is really enjoying the Modern Age Coders classes. This is his first online class and he eagerly looks forward to it. I can already see his improvement, and the teachers are very cooperative."

Sonam Oswal

Parent of Dhairya

★★★★★

"Modern Age Coders have wonderful teachers who teach in a clear, easy and practical way. The teacher boosts students' confidence and inspires them to learn without hesitation."

Sonu Goyal

Parent

★★★★★

"I highly recommend this computer coding class! The teachers are incredibly knowledgeable and passionate about coding."

Ritu Kedia

Parent

Free placement class

Share an age and an interest to begin

With those two details a teacher can prepare a first lesson. A Year 3 child might build a Scratch clicker game; a teenager or adult might reproduce the Chatswood growth comparison in Python.

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FAQ

Willoughby coding and AI questions

Common questions from families across the council area.

How many people live in the City of Willoughby?

The 2021 Census QuickStats for the Willoughby local government area counted 75,613 residents, with a median age of 39 and 20,701 families.

Why can monthly percentage changes not be added?

Each percentage is measured from a different starting value, so adding them double-counts or misses growth. Log differences avoid this: they add exactly, and the total converts back to the true percentage change.

What does the Chatswood project find?

From October 2024 to August 2026 Chatswood entries rose 17.79%, but the 22 monthly percentage changes sum to 21.75%. At St Leonards the summed percentages show growth of 10.65% although entries fell 2.09%.

Which stations are inside the Willoughby council area?

Our location check against the statistics bureau's boundary places three stations inside it: Chatswood, Artarmon and St Leonards.

Do classes help with school maths?

Coding projects often use the same ideas as the NSW Mathematics syllabus, such as percentages and logarithms. Our teachers explain methods, and any assessed school work remains the student's own.

When do lessons run?

Times are agreed at the trial, typically after school or at weekends, and quoted in Sydney time. India is 5 hours 30 minutes behind Sydney in summer and 4 hours 30 minutes behind in winter.

How young can a learner start?

From six, with Scratch. Python and data projects such as the Chatswood comparison usually begin around 12 to 14.

Do you teach from a centre in Chatswood?

No. Every lesson is live online and we have no premises anywhere in Australia. A computer with sound and a stable internet connection is enough, and the contact number we display is in India.

How much do coding classes in Willoughby cost?

The first lesson is free. Group classes cost USD 100 a month for two live lessons a week, about eight in total, with fifteen to twenty learners; one-to-one is USD 150 a month at the same frequency. Fees start only after the course and time are agreed.

How many learners are in a group?

Fifteen to twenty, placed by level and goals rather than by age or school. If no group fits the learner's availability, one-to-one lessons are arranged.

More to read

Further guides for Willoughby families

For the whole city see coding classes in Sydney. Families of younger children can browse coding classes for kids in Sydney, and older students thinking about AI can read learn to think, not just use AI tools. The state guide is coding and AI classes in New South Wales.

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