Fill in each box with a one-digit positive integer. In each row, the product of the integers in the boxes must equal the number shown next to the = sign at the end of the row.
?
X
?
= 21
+
?
X
?
= 45
?
X
?
= 54
Sample "+" Puzzle
In each row, the integers in the boxes together form a two-digit number. The two-digit number in the bottom row's boxes must equal the sum of (if +) or the difference between (if -) the two-digit numbers in the top and middle rows' boxes.
Try to solve the puzzle as quickly as you can. The faster you complete the puzzle, the better your score will be!