5x5=25
25x25=625
35x35=
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Write down 25 first.
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Add 1 to the number before 5, i.e 3 = 3+1= 4
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Multiple it (4) with the number before 5, i.e 3 x 4=12
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Write it (12) down before 25, i.e 1225.
Try one more? 65x65 will be 6 x (6+1= 7) followed by 25 = 4225
Have fun and keep your grey matter fresh.
kind regards.
You can bet it with your friends and get some free coffee and snacks.