Crossum - Math Puzzle

Do you like maths ????
Battle against time and do the correct sums !!!!
Test your abilities in calculations and solve the patterns that Crossum offers in the least possible time...
Work out the sums requested in the lines and the columns of the grid by moving the numeric boxes, but hurry up because the seconds that you manage to save will be accumulated for the next round which will be more complex than the previous!!!
Win all 20 rounds as soon as possible.
Crossum is a real fun game that keeps your mind trained!