Sense Maths

When will I ever use this?

Free, hands-on maths that starts with a real problem, lets you play with it, and only then gives you the formula.

Try scaling a recipe See how it works
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Each extra person adds the same blocks of flour and milk. That one idea is ratio and proportion.

Every page works the same way

Most lessons start with the formula and hope you'll see the point later. These start with the problem, so the formula arrives when you can see why you need it.

Pick any topic below. You'll always know where you are, and you can't skip to the answer without noticing the pattern first.

  1. 1

    The situation

    A real problem you might actually face.

  2. 2

    Change it

    Move a slider and see what happens.

  3. 3

    Watch it respond

    The picture and the numbers update together.

  4. 4

    What do you notice?

    Spot the pattern yourself before anyone tells you.

  5. 5

    Now it has a name

    Only now do you get the formula, and use it on a new problem.

Pick a topic

Scaling a recipe

Ratio and proportion

Cook pancakes for one person or twenty and see why the amounts change but each person's share doesn't.

Open this topic

On the way

  • How much water is in this tank?Volume of a cylinder
    Coming soon
  • Is this sale really 30% off?Percentages
    Coming soon
  • Will I get there in time?Speed, distance and time
    Coming soon
  • How much flooring do I need?Area
    Coming soon

Free to use

Sense Maths is there to help people see why maths matters, not to sell them anything.

  • No accountsOpen a page and start.
  • No advertsNothing competing for your attention.
  • No tracking scriptsThe pages don't load any.
  • Works offlineAfter your first visit, it still opens without a connection.