Mental Math

Today we spent a long time reviewing how to approach Mental Math questions.  We worked on the questions on p. 98 which served as good review for the test.  One way the students figured out how to answer 1000-299 was 1000-300= 700 so 1000-299=701.  There was some difficulty with understanding that they would actually have more for their answer in the second example.  I decided to show them how to think about the problem using smaller numbers.  For example 10-6=4 and 10-5=5.  I told them to think about it as if you take away less you keep more.  It is not an easy concept.

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