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Mr. Olmsted's and Mr. Snyder's Fifth Grade Class



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Math Help

Links to CMP2 Publications (Parent Help)

This CMP2 site lists the units and includes a parent newsletter with important
concepts and examples:

This website was designed to answer some of the questions and concerns you
might have including Homework Tips, Mathematical Help, a Glossary, Research
Results, and general information about the Connected Mathematics Project.

 

Step 1


The first thing you must master is the multiplication table through 12 times 12.
 
If you think about it... there aren't that many.
Because 6x4 is the same as 4x6, almost half of the facts are duplicates.
You already know that anything times 1 is itself.
And you probably know your 2s, 5s, 10s, most 11s, and some 3s.
Here's what is left!

X 1 2 3 4 5 6 7 8 9 10 11 12
1 1                      
2   4                    
3     9     18 21 24 27     36
4       16   24 28 32 36     48
5         25             60
6           36 42 48 54     72
7             49 56 63     84
8               64 72     96
9                 81     108
10                   100 110  120
11                     121 132
12                       144
 
We are now in a unit called PRIME TIME.  The unit revolves around the composition of a number as seen through its factors.  Numbers are wither Prime or Composite.  Prime numbers can only be divided by themselves and one, while composite numbers have other factors.  17 is prime, while 25 is composite.
 
Home Practice

There is a great deal of math you can do at home in little moments here and there.  Checking to see whether or not one number is divisible by another, say 130 by 6, is a great activity that can be done in your head.  We do this in class.  What I tell the kids to do is pick a number that is as close as possible to 130 that you know for sure that 6 goes into.  In this case 120 comes to mind.  Then you can look at the difference between those numbers.  130 is 10 away from 120.  If 6 goes into 10 then 6 goes into 130.  Practice makes perfect - give it a try.
 

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