Solving Sudoku puzzles made easy (part 1)

First do the easy ones, i.e. the 1 in the bottom-right box and then the 3s, which seem fairly straightforward.
That leaves you with only place where 5 can go in the bottom-left box.
The 7s are a bit trickier, but if you mentally shade the cells in the top-right and middle-right boxes where a 7 can't go, you see that they must be on the top row in each box, so in the top-left and centre boxes, they must be on the bottom row.
Full series here.