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Mental Math

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  • 99-?=98
    1
  • 100+56=?
    156
  • 84-31=?
    53
  • 67-46=?
    21
  • 77-34=?
    43
  • 12+?=35
    23
  • 41+39=?
    80
  • 45+?= 77
    32
  • 15-7= ?
    8
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