Each square comprises 8 intersecting sums, 4 across and 4 down. This makes the 8 sums a lot more interesting.
Remember to divide and multiply before adding and subtracting. In maths, this is called the order of precedence. If a sum has both divide and multiply, you can do either of these first, whichever is easiest. The result will be the same.
There are 180 squares, two per page. They are a challenge but your skills will improve quickly, and you'll be surprised at how fast you can solve them!
Have fun with these.