Posted by June on Sunday, September 7, 2008 at 11:34am.
I have three questions...
Okay think of a 19 multiplication table.
1. Are there more odd or even products? How can you determine the answer without counting?
2. Is this different from a 19 addition facts table? Explain.
And for the last one don't use the table or anything else.
3. Explain why it is helpful to use a plan to solve problems. Include an explanation of the importance of performing each step of the fourstep plan
(Fourstep problem solving plan: Explore. Plan. Solve. Check)
I just can come up with the answers! Can you help?!

Mathematics  drwls, Sunday, September 7, 2008 at 12:18pm
In such a table, without zeroes, there are 9 x 9 = 81 entries. 5 x 5 = 25 are oddodd products (and therefore odd); 4x4 = 16 are eveneven products (and therefore even) and 2x4x5= 40 are evenodd products (and therefore even).
Only 25 of the 81 entries are therefore odd.
The results will be different for a 19 addition table, because you need odd + even to get odd. Other combinations are even.
Use your own words to answer 3. 
Mathematics  eduado, Tuesday, September 9, 2008 at 4:28pm
12x whenx=5