Online Self-Tests(A18)

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  1-2. Find the unknown values.

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  (1 point each)

  
  

  1	2	+	1	3	=	3
  	3			4

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  3-4. Find the unknown values.

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  (1 point each)

  
  

  1	1	+	1	1	=	4
  	4			5

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  5. Find the unknown value.

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  (1 point each)

  
  

  1	1	=
  	3		6

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  6. Find the unknown values.

  
  

  1	4	+	1	x	=	3	7
  	5			3			15

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  (1 point)

  
  

  Answer:

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  7. Find the unknown values.

  
  

  1	x	+	1	1	=	3	1
  	4			2			4

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  (1 point)

  
  

  Answer:

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  8. Find the unknown values.

  
  

  2	x	+	1	1	=	4	1
  	4			2			4

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  (1 point)

  
  

  Answer:

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