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Online Self-Tests(S21)


  • 1. Determine the unknown value that makes the equation true.

    (1 point)

    		–21

    =

    		210


  • 2. Determine the unknown value that makes the equation true.

    (1 point)

    70–

    =

    		7


  • 3. Determine the unknown value that makes the equation true.

    (1 point)

    		–90

    =

    		9


  • 4. Determine the unknown value that makes the equation true.

    (1 point)

    50–

    =

    		5


  • 5. Determine the unknown value that makes the equation true.

    (1 point)

    		–27

    =

    		100


  • 6. Determine the unknown value that makes the equation true.

    (1 point)

    300–

    =

    		30