In this worksheet, you must use an inverse or opposite operation.

It is easy to make mistakes when using a calculator. 

Check your answers using an inverse operation.

Remember that ADDING and SUBTRACTING are inverses.

Example 1:

467 + 94 = 561

Check:

561 − 94 = 467  

Example 2:    

952 − 734 = 218

Check:    

218 + 734 = 952