Tuesday, February 24, 2015

Addition and subtraction math story problems

Do we use a + or a -?  Are we putting things together or taking them apart?  

There were six crabs on the beach and 3 snails crawled up.  How many sea creatures were there in all?  Or Five sea turtles were in the sand.  Then 2 swam away.  How many sea turtles were left?  What kind of math sentence do we write?  Addition or subtraction?

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