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Mental Math Strategies

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  • 9+9=?  Strategy?
    18 - Doubles
  • 6-2=?  Strategy?
    4 - Counting back
  • 4-3
    1
  • What mental math strategy would you use to solve this question?
    Friendly 10s
  • 9+3? Strategy?
    12 - Count on
  • What strategy would you use to solve 6+6?
    Doubles
  • 3+3?  Strategy?
    6 - Doubles
  • What strategy would you use to solve 9+1?
    Counting on or Friends of 10
  • 5+3
    8
  • 7-3
    4
  • You use this strategy when you are adding or subtracting 1, 2 or 3
    Counting on and counting back
  • 8+8?  Strategy?
    16 - Doubles
  • 2+8?  Strategy?
    10 - Friends of 10
  • 21 + 40? Strategy?
    61 - Jump strategy
  • 6+4
    10
  • 36 - 10? Strategy?
    26 - Jump strategy
  • 10 + 10? Strategy?
    20 - Doubles or jump strategy
  • 5 + 6?  Strategy?
    11 - Near Doubles
  • What strategy would you use to solve 6-3?
    Counting back
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