| 22. Lady Bug Subtraction
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| http://www.bbc.co.uk/schools/laac/numbers/ch2.shtml |
| Rating:
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| 23. Two Minute Warning
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| Race against the clock to see how many subtraction problems you can solve correctly in two minutes. |
| http://www.primarygames.com/flashcards/subtraction/start.htm |
| Rating:
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