Online Self-Tests(S1)

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  1-2. Find the unknown values.

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  (1 point each)

  
  

  2	–	2	=
  3		5

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  3-4. Find the unknown values.

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  (1 point each)

  
  

  1	–	2	=
  2		7

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  5. Find the unknown value.

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  (1 point each)

  
  

  	3	=
  	15		5

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  6. Find the value of x.

  
  

  x	–	1	=	2
  4		3		12

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  (1 point)

  
  

  Answer:

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• 
  

  7. Find the value of x.

  
  

  5	–	x	=	4
  6		2		12

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  (1 point)

  
  

  Answer:

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• 
  

  8. Find the unknown value.

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  (1 point)

  
  

  13	=		1
  2			2