02 Word Problem (Before/After)

John had $40 more than Ali.
After John spent half of his money, Ali had $20 more than John.
How much money does John have at first?

Here is a typical before/after word problem.Again, I shall tackle this word problem “statement by statement”.

John had $40 more than Ali.

This is a simple enough statement that most pupils can draw (I hope :-)) I will be showing the screenshot of the model (instead of video)
Possible question to ask : Who has more ? How much more?

 After John spent half of his money, Ali had $20 more than John

Break this statement into 2 part. Let’s focus on “Ali had $20 more than John”.
Possible questions to ask: Who has more now? How much more? How are the “before and after” bars of Ali related ? Did Ali spend any money?

 After John spent half of his money, Ali had $20 more than John
Now, let’s handle the first part of the statement (“After John spent half of his money”).

Possible questions to ask: Does John has less money after spending money ? How are the “before and after” bars of John related related ? 

The final step is to draw the dotted lines to make the model more clearer.  Possible questions to ask : How are the “20” and “40” related to any parts on the model?

 

 

 

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