Little world math concepts

Author
Matzke, Ann H Mattern, Joanne Allen, Nancy Kelly Meredith, Susan Duke, Shirley Smith
 
1)  Can you guess?
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[2011]
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[2011]
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c2011
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[2011]
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8)  Plus 0, minus 0
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[2011]
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11)  Sequence it!
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c2011
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15)  My math toolbox
16)  What's a fraction?
17)  Who's right, addition or multiplication?