Fill your maths map blue, one square at a time.
Each of the 69 topics from P1 to S3 is a square on the map; master one and its square turns blue.
No sign-up and nothing to install; works on phones, tablets and computers.
Get it wrong, and it tells you why.
Every question knows the usual wrong answers: a wrong answer gets a hint about that exact mistake, then a worked solution.
- Three levels, Basic to Challenge, that step up as you get answers right
- Hints, a scratchpad and read-aloud
- Wrong answers go into the mistake book to try again later
Mum has $1000. She spends 3/4 of it on food, then 3/5 of what is left on stationery. How much does she spend on stationery?
In Chinese, in English, or in both.
Every lesson, question, hint and solution is written in both languages; the English follows Hong Kong textbooks.
- 中
- Chinese only
- 中英
- English, with the Chinese under it
- EN
- English only
Multiplication of Fractions分數乘法
To multiply fractions, multiply the numerators together and the denominators together.分數乘分數：分子乘分子，分母乘分母。
2/3 × 3/4 can be read as “2/3 of 3/4”: the overlap is 6 of the 12 squares.2/3 × 3/4 可以理解為「3/4 的 2/3」：兩部分重疊的是 12 格中的 6 格。
2/3 × 3/4 = 6/12 = 1/2
- numerator分子
- denominator分母
- product積
- simplest form最簡分數
- cancel before multiplying先約後乘
Five steps for every topic.
Understand it, get fluent, then keep it: after the fifth step, its square on the map turns blue.
Learn學習
A few minutes of lesson and worked examples, with tools such as a clock, coins and a balance.
Practise練習
Unlimited new questions at three levels, stepping up as you get them right.
Drill熟練
Six rounds of ten questions, each done accurately within a target time. Optional.
Quiz小測
Ten questions, no hints, and the answers at the end.
Review溫習
Reminders to review after 2, 5 and 12 days.
Open it and see what to do today.
Blue Maths sets out each day’s work from your progress; when it is done, you are done.
Today’s route
Redo mistakes, practise, take a quiz: about 20 minutes.
Mistake book
Every wrong answer is kept until you get it right.
60-second sprint
Mental maths against the clock, with your best score kept.
Mock exams
School-exam and Pre-S1 style papers in Sections A, B and C, with a report by topic.
15 interactive tools
A clock, coins, fraction bars, a balance, Pythagoras, a graph plotter and more, to move by hand.
20 badges
For effort and progress. No lucky draws.
A weekly report, ready for WhatsApp.
Questions answered, accuracy, the most improved topics, mistakes fixed and what to practise next week, on one image.
- Works without an account; sign in to sync between devices
- Several children on one device
- Export a backup at any time
A worksheet in thirty seconds.
Pick the topics, level and number of questions, then print an A4 worksheet with its answers; the questions are new every time, so one topic gives an A and a B paper.
- Preview every topic’s questions and answers
- Add your own questions to your students’ practice
- Worksheets in Chinese, English or both
69 topics, from P1 to S3.
Arranged on the Hong Kong primary and junior secondary curriculum; pick a strand to follow it from P1 to S3.
P18 topics
P28 topics
P310 topics
P48 topics
P56 topics
P67 topics
S17 topics
S27 topics
S38 topics
Pick a topic to see what it covers.
Started by a retired maths teacher.
Blue Maths is made by a retired Hong Kong maths teacher and family.
Understand, then practise
Every topic starts with a short lesson and worked examples.
Mistakes are clues
Hints answer the usual misunderstandings, and mistakes come back until they are fixed.
Just the maths
No ads, no lucky draws and no mini-games in the way.
Questions parents ask.
Does it cost anything?
Every feature is free at the moment.
Do I need an account or an app?
No. Open the website and start; progress is saved on the device. To sync between phones, tablets and computers, sign in with Google or your email; we suggest a parent does. In a phone or iPad browser, choose “Add to Home Screen” to open it like an app.
Does it follow the Hong Kong curriculum?
Yes. The 69 topics from P1 to S3 are arranged on the Hong Kong primary and junior secondary curriculum, and the English follows Hong Kong textbooks.
Chinese, English or both?
Any of the three, and you can switch at any time. In 中英 the English sits above the Chinese.
Who is it for?
Students from P1 to S3. Every topic has three levels, so a child can start from the basics or go on to challenge questions, and go back to earlier years at any time.
Can teachers use it in class?
Yes. The teacher tools make worksheets with answers, preview every topic’s questions and let you add your own.
What about privacy?
Without an account, learning records stay on your device. When you sign in, progress is stored in the cloud so it can sync. Student profiles need only a nickname; we do not sell data and there is no ad tracking. See the Privacy Policy.