These printable worksheets use 100 squares to look at prime numbers.

There are four PDFs each with a different variation, and there are six 100 squares to a page.

• The first is a simple 100 square for children to try to pick out the prime numbers
• The second has the prime numbers coloured up
• The third only features the prime numbers with the rest of the squares empty
• The fourth has the non-prime numbers in a light grey so it’s more ink-friendly than sheet 2

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