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- A fun way to learn the prime numbers less than 100
- A set of 25 pixel picture puzzles
- Shade the squares that have prime numbers
- Identify Prime and Composite (non-prime) numbers
- 3 levels of difficulty
- Worksheets (A5/A4) + ANSWERS + blank grids
- Guidance/Instructions**

Prior Knowledge Required

Being able to identify some if not all the prime numbers less than 100

unless you use this as an activity for this purpose.

This is an activity designed to make the learning of PRIME numbers much easier and I have been surprised, in the past, how successful it has been.

Start with the PRACTICE question if needed.

For this and

ONE STAR PUZZLES the if you work through the grid,

starting in the top left hand corner and work left to right and row by row the sequence of PRIME NUMBERS <100 appear IN ORDER.

So find 2 and work through to 97

The sequence repeats (partially in some cases) up to the prime needed complete the puzzle

Get them to do this methodically - this is how they pick up the sequence ( a printed sequence for them to have alongside may scaffold the initial process).

TWO STAR - Same rules but generally a larger grid

THREE STAR - Usually a larger grid but primes not in a particular

order although some part of the prime sequence may

occur. (Find a 2 and it may be next to a 3, then a 5,

then a 7 etc etc)

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I have provided some blank grids for pupils to make up their own puzzles.
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Draw a picture by colouring in a small grid.

Then working with a larger grid get them to write LIGHTLY SHADE their picture onto a big grid

In each shaded square they then write a PRIME NUMBER (in sequence at first as in a one star puzzle) which gets them writing out the primes)

FILL IN THE REST OF THE GRID WITH NON-PRIME which is an equally IMPORTANT TASK

EITHER COPY THIS ONTO ANOTHER BLANK GRID or use COMPUTER and TABLE IN WORD, POWERPOINT or similar to produce a printable puzzle.

I have used ADOBE’s InDesign to make this set of puzzles

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