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Addition within 40

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  • Group into tens and ones to add: 20 + 15
    20 + 15 = 35
  • Count on to add: 15 + 4
    15 + 4 = 19
  • Use a place value chart to add: 23 + 12
    23 + 12 = 35
  • Use a place value chart to add: 23 + 16
    23 + 16 = 39
  • Group into tens and ones to add: 31 + 4
    31 + 4 = 35
  • Count on to add: 23 + 5
    23 + 5 = 28
  • Use a place value chart to add: 16 + 12
    16 + 12 = 28
  • Use a place value chart to add: 30 + 3
    30 + 3 = 33
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