Posted by Jess on Sunday, February 24, 2013 at 6:06pm.
Dalia made 8 party bags for her birthday party. Each bag contained 4 small gifts for her friends. When Denis said that she could come, Dalia had to make one more bag with 4 gifts. How many small gifts did Dalia need to fill her bags?
Walter wrote this number model: 8 x (4+4)=64
Explain what Walter's mistake.

Math  Lena, Sunday, February 24, 2013 at 6:14pm
1 Bag = 4 Gifts
Total # of party bags = 8
Total # of part bags + Denis = 9
So originally the # of gifts without Denis would have the following equation:
8 x 4 = 32
Now that Denis is coming we have 9 party bags:
9 x 4 = 36
OR
(8 x 4) + 4 = 36
So you see that the mistake is where Walter placed his brackets. Does this make sense? 
Math  Jess, Sunday, February 24, 2013 at 6:19pm
Oh I get it now, okay thank you very much!!

Math  Lena, Sunday, February 24, 2013 at 6:26pm
No problem :)