One topic I was pondering a lot was whether to include problems such as
15 + x = 30 into the worksheets.
Or, 234 + x = 700
or x + 1,923 = 5,000.
I hope you get the idea; in elementary books you often see these kind of missing addend problems with a little box:
15 + = 30 or
234 + = 700 or
+ 1,923 = 5,000.
Well, I decided for the x over the box! I don't think solving missing addend problems with subtraction is too difficult to learn on fourth grade; after all, students have been working with addition and subtraction connection from 1st grade on, right?
In my own old schoolbooks I actually see x from 3rd grade on.
I made several problems with charts such as
Write a missing addend sentence
and a subtraction sentence to solve it.
1,500
|------------|-----|
x 346
Hopefully those help the students with algebraic thinking.
Tags: math, elementary, algebra
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