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15 x 4 = 60 of them.

Answer:

It depends on how you look at the grid. It can be looked at as a grid of small squares or the quares can be organized into larger units.

Taken as independant small squares there are 4x15=60 squares. However each 16 congruent squares sharing a common 4x4 orientation can be grouped into a larger square, similarly each 3x3 and 2x2 larger quare that can be formed by groupong can be added to the total:

1x1 squares: 60

2x2 squares: 42

3x3 squares: 26

4x4 squares: 12

Total:140

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