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Add two 4-digit numbers - no exchange
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? + 3 tens = 1 hundred
7 tens
Oops!
Okay!
5 tens + 5 tens = 1 ?
hundred
Oops!
Okay!
7 + ? = 15
8
Oops!
Okay!
? + 6 tens = 1 hundred + 5 tens
9 tens
Oops!
Okay!
8 tens + ? = 1 hundred + 2 tens
4 tens
Oops!
Okay!
7 tens + 4 tens = 1 tens + ?
1 hundred
Oops!
Okay!
70 + 50 = ?
120
Oops!
Okay!
? + 4 tens = 1 hundred
6 tens
Oops!
Okay!
10 hundreds = ? thousand
1
Oops!
Okay!
9 tens + ? = 1 hundred + 7 tens
8 tens
Oops!
Okay!
4 + ? = 10
6
Oops!
Okay!
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