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Do the sums

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  • nineteen (19) + one (1)
    twenty (20)
  • eleven (11) + three (3)
    fourteen (14)
  • thirteen (13) + two (2)
    fifteen (15)
  • sixteen (16) + two (2)
    eighteen (18)
  • twelve (12) + four (4)
    sixteen (16)
  • thirteen (13) + four (4)
    seventeen (17)
  • seventeen (17) + one (1)
    eighteen (18)
  • fifteen (15) + five (5)
    twenty (20)
  • twelve (12) + seven (7)
    nineteen (19)
  • fourteen (14) + six (6)
    twenty (20)
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