The answers…
The letters one -the letters one - think numbers one to ten O,T,T,F,F,S,S,E,N
The numbers one - is the sum of the three adjacent squares - i.e. 13 is the sum of 3+5+5... You then add 5+13+7 and you get 25 in the next two holes, and then add 13+25+25 to get 63.
The join the dots one -
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The line one - They are the same size
The circle one -Â They are the same size