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Add two 4-digit numbers - no exchange

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  • 5 tens + 5 tens = 1 ?
    hundred
  • 7 tens + 4 tens = 1 tens + ?
    1 hundred
  • ? + 4 tens = 1 hundred
    6 tens
  • 7 + ? = 15
    8
  • 70 + 50 = ?
    120
  • ? + 6 tens = 1 hundred + 5 tens
    9 tens
  • 8 tens + ? = 1 hundred + 2 tens
    4 tens
  • 9 tens + ? = 1 hundred + 7 tens
    8 tens
  • ? + 3 tens = 1 hundred
    7 tens
  • 4 + ? = 10
    6
  • 10 hundreds = ? thousand
    1
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