Puzzle Copyright © Kevin Stone

Objective / Rules

• Complete the grid using all of the numbers from 1 to 9.
• When completed, all of the sums must be correct.
• The sums are solved strictly from left to right, and top to bottom.
• The normal order of mathematical operations is ignored.
• For example, 2 + 5 x 9 is calculated as (2 + 5) x 9 = 63.
• ÷ 1 doesn't appear in the puzzle.
• x 1 doesn't appear in the puzzle, although there might be 1 x.
• At no point will any calculation go below zero, or become fractional.