Common Core Standards
There's one shark left. If half the sharks were eaten by bacteria and three were eaten from the remaining sharks, how many were there to begin with? The real question is, how did flesheating bacteria kill half the sharks so quickly? We were under the impression that sharks were pretty indestructible...
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TwoStep Equations using Multiplication/Division 
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Remainders 
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Multiplication and Division of 1 digit numbers 
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Long Multiplication 
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Long Division