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About NumBlocksGen

NumBlocksGen wordmark with colourful number cubes.

What you can do here

  • Play the Number Blocks Generator. Change a number and watch a block character change with it. Our remix adds a live Number facts panel and a Break it down button.
  • Use the Number Blocks Tool. Our own tool: type any whole number to see its place value, odd/even and prime status, factor pairs, block and rectangle pictures, and print a practice card with answers.
  • Read the lessons. Short explainers on place value, counting, odd and even, primes, factors, rounding and more, each with practice questions and answers.
  • Try a few maths and logic games made by Scratch creators, each with notes on the skill it practises.

Why the site exists

Watching a number grow on screen is fun, but children learn more when someone asks "why?" afterwards: why does 10 look different from 9, why can 12 make a rectangle and 13 cannot. NumBlocksGen pairs the generator with a tool and lessons that answer those questions, so a short play session can turn into real number work.

Who runs it

NumBlocksGen is a small independent site run by one editor. There are no user accounts and nothing to buy. The site is supported by advertising.

How content is made

The Number Blocks Tool, the lessons and the teaching notes on game pages are written by NumBlocksGen. The maths in them is standard primary-school content; where we give an age range it is a rough guide, because curricula and children differ. If you spot a mistake, tell us and we will fix it.

Games, credits and licences

The generator and the other games are community projects shared on Scratch under the Creative Commons Attribution-ShareAlike 2.0 licence. Each one is credited to its creator with a link to the original. The generator is a remix: we changed its interface and prompts and share our version under the same licence. Full details are on the credits page.

Independence

NumBlocksGen is not affiliated with, endorsed by or connected to the BBC, Alphablocks Ltd, Blue Zoo, the Scratch Foundation or MIT. Any similarity of block characters to characters from television belongs to the original Scratch project, not to this site.

Contact

Corrections, credit questions or ideas for the tool: see the contact page.