Online Self-Tests(A20)

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  1-2. Find the unknown values.

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  (1 point each)

  
  

  1	2	+	1	3	=	3
  	3			7

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  3-4. Find the unknown values.

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  (1 point each)

  
  

  1	1	+	1	1	=	2
  	7			4

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  5. Find the unknown value.

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  (1 point each)

  
  

  1	4	=
  	8		2

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  6. Find the unknown values.

  
  

  2	1	+	1	x	=	4	1
  	3			6			6

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  (1 point)

  
  

  Answer:

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  7. Find the unknown values.

  
  

  2	x	+	1	5	=	4	1
  	3			6			3

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  (1 point)

  
  

  Answer:

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  8. Find the unknown values.

  
  

  2	x	+	1	1	=	3	4
  	3			9			9

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  (1 point)

  
  

  Answer:

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