Add, Subtract, Divide, Multiply - Crossword

Complete the crossword, then click on "Check" to check your answer. If you are stuck, you can click on "Hint" to get a free letter. Click on a number in the grid to see the clue or clues for that number.
1   2   3         
 4    5        
 6     7       
         
  8     9      
    10     11   12   
 13      14      
         
15     16        
   17