Follow the clues to find the mystery number.
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A particular technique for solving Sudoku puzzles, known as "naked pair", is explained in this easy-to-read article.
Natalie and Holly from Queen's Manor Primary School sent this letter they had written:
This letter is very clear - well done both of you for extracting the relevant information from all those cards. I'm not sure that the packed lunch will be free if the child has a school dinner, but I understand what you mean - children who have school dinner won't have to pay extra for a packed lunch. That's the way I understood it, anyway. Perhaps you don't agree?
Andrew and Laith from JESS Jumeirah Primary School in Dubai also worked on this activity. They sent in copies of their workings:
Here is the letter they wrote: