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Making ten to add

Quiz yourself by thinking what should be in each of the black spaces below before clicking on it to display the answer.
        Help!  

Question
Answer
7+3 has the same answer as 10+0   True  
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8+5 has the same answer at 10+3   True  
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9+4 has the same answer as 10+6   false  
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Fill in the blank 6+____=10   4  
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Fill in the blank 20+_____=30   10  
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Fill in the blank 6 ones+_____ ones = 10 ones   four ones  
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57+____= 60   3  
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If I have 4 ones, how many more groups of one do I need to make 10 ones?   6 ones. If you have 4 but need ten, you would need six more.  
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Created by: cmoon
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