Easy to Medium Calcudoku Puzzles 7x7 Book for Adults

The book contains 200 Calcudoku puzzles 7x7 at the level of Easy to Medium. Easy puzzles 100, Medium puzzles 100. All riddles have only 1 solution. Each puzzle consists of a grid containing blocks surrounded by bold lines. The object is to fill all empty squares so that the numbers 1 to N (where N is the number of rows or columns in the grid) appear exactly once in each row and column and the numbers in each block produce the result shown in the top-left corner of the block according to the math operation appearing on the top of the grid. In Calcudoku a number may be used more than once in the same block.