Online Self-Tests(A20)

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  1-2. Find the answer to the equation.

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  (1 point)

  
  

  4	+	(	1	+	1	)	=
  9			9		3

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  3-4. Find the answer to the equation.

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  (1 point each)

  
  

  5	–	(	1	+	1	)	=
  9			3		9

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  5-6. Find the answer to the equation.

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  (1 point each)

  
  

  5	+	(	1	–	1	)	=
  9			3		9

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  7. Find the unknown value that makes the equation true.

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  (1 point)

  	+	2	=	8
  3		9		9

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  8. Find the unknown value that makes the equation true.

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  (1 point)

  1	+		=	4
  9		3		9

• 
  

  9-10. Find the answer to the equation.

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  (1 point each)

  
  

  1	+	2	=
  3		5