Saturday, May 3, 2008

Missing Numbers (Maths)

I was asked the other day on how to communicate the concept of 'Missing Numbers' to Primary 1 and 2 students. They are getting such questions in their school's exercises. By the end of Primary 1 students should understand this 'reversibility'.
For example:

3 + ____ = 9 and in different variants like ____ + 4 = 9.

Then how about the subtraction like, 7 - ____= 4.
Getting more challenging will be the 2-digits problems.
We know the answer by using the concept of simple algebra. But how are we going to explain to young children the logic.
It is good in maths to move the students from the concrete to the abstract.
After some research, I found that the following may be a good approach.

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