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Practice Problems
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1
10, 20, 30, ? — what comes next?
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Answer 40
2
40, 50, 60, ? — what comes next?
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Answer 70
3
How many groups are there?
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Answer 3
4
How many stars are in each group?
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Answer 4
5
3 groups of 4 — how many stars in total?
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Answer 12