In a 2 by 2 grid, both diagonals of every small square are drawn. How many squares (upright or tilted) are there in the figure?

Upright squares: 4 small + 1 big = 5. Tilted squares: the big one joining the midpoints of the outer sides, plus 4 small ones, each with one corner at the centre of the grid and the opposite corner at a side midpoint: 5. Total $5+5=10$.