Counting the squares
Algebra
Level
2
How many squares are there in the unit grid shown above?
20
64
190
65
240
385
304
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1 solution
n u m b e r o f s q u a r e s = 1 0 ( 1 0 ) + 9 ( 9 ) + 8 ( 8 ) + 7 ( 7 ) + 6 ( 6 ) + 5 ( 5 ) + 4 ( 4 ) + 3 ( 3 ) + 2 ( 2 ) + 1 ( 1 )
n u m b e r o f s q u a r e s = 1 0 0 + 8 1 + 6 4 + 4 9 + 3 6 + 2 5 + 1 6 + 9 + 4 + 1 = 3 8 5