Study

Y1_Subtraction within 40

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  • 30 - 0 
    30
  • 40 - 10 
    30
  • 25 - 7 
    18
  • 23 - 9 
    14
  • 40 - ? =17
    23
  • 32 - 15 
    17
  • 35 - 9 
    26
  • 35 - 23
    12
  • 27 - 15 =
    12
  • 36 - 18 
    18
  • 35 - 7 
    28
  • 36 - 7
    29
  • 27 - 16 =
    11
  • 30 - ? = 15
    15
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